I flew on United again during the pandemic and found it to be a leading contender for best US airline to fly in 2021 - here's why

• United Airlines is one of my new favorite airlines to fly during the pandemic.
• I wasn't overly impressed by the airline in 2020 but new improvements have me wanting to come back.
• Numerous social distancing precautions were in place at every turn and I was surprised to see an onboard snack and drink service.

United Airlines had a rocky start to social distancing during the pandemic.

A botched seat blocking policy was quickly abandoned after a customer exposed the airline failing to keep seats open on a flight from Newark to San Francisco. The airline opted to fill flights but not assign middle seats unless necessary, instead offering free flight changes to passengers that didn't want to travel on fuller flights.

Out of the big four US airlines, United joined American Airlines in filling planes while Delta Air Lines and Southwest Airlines blocked seats. I took two flights on United in June 2020 and the airline didn't quite impress with its inconsistent social distancing measures and flights with no in-flight service.

Some of those inconsistencies remain but my latest experience on the airline showed how far the airline has come. Aircraft are still being filled to capacity, a policy now adopted by all major US airlines besides Delta, but United has made improvements to its offering and brought back some amenities that harken back to pre-pandemic times and ultimately make for a better travel experience.

I flew on United once more, this time in February from Denver to Houston, Texas on the airline's first Boeing 737 Max flight in nearly two years.

Here's what flying United is like in 2021.

My United journey started at Denver International Airport where I'd catch the 7:50 a.m. flight to Houston.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider

I headed to the check-in area and immediately noticed that it had been entirely overhauled with social distancing measures.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider

Each check-in station had plexiglass partitions separating United staff from passengers...

Flying United Airlines during the pandemic.      Thomas Pallini/Insider

And kiosks had plastic dividers between them with the option for "touchless check-in" by using a mobile device if a user didn't want to touch the screen.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider

Even signage above the check-in area was promoting proper face-covering rules. It was an impressive overhaul and more so than I've seen from some competitors.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider

Before I even got to the kiosk, I was required to acknowledge United's face covering rule...

Flying United Airlines during the pandemic.      Thomas Pallini/Insider via United Airlines

And the health declaration when I checked in online. I had to affirm that I hadn't tested positive for COVID-19 in the past three weeks nor had I been exposed to the virus, as well as been experiencing any symptoms.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider via United Airlines

I also had to confirm that I wasn't awaiting COVID-19 test results and no other airline had denied me boarding. These requirements were definitely more strict than others I'd seen in my travels.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider via United Airlines

United is also offering contact tracing so customers are asked to provide their contact information; though, the program is optional.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider via United Airlines

My flight to Houston was for a special occasion, United's first Boeing 737 Max passenger flight since March 2019, and it was nearly sold out as aviation enthusiasts flocked to Denver to be on the first flight.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Read More: I flew on United Airlines' first Boeing 737 Max flight in nearly 2 years and it was just the boring flight the airline needed

United informed me that the flight was filling up at check-in and I was offered the option to change to a different flight for free. It's a nice gesture but I've found it's rarely helpful.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider via United Airlines

There was no shortage of alternate options on the Denver-Houston route but other routes don't have as many backup options since the pandemic forced airlines to reduce flights. And there's no guarantee any of these flights wouldn't also fill up with passengers.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider via United Airlines

The gate area for my flight featured many of the same measures as check-in, including a banner reminding passengers to wear face coverings and social distance, as well as highlighting United's partnership with Clorox and the Cleveland Clinic,

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Gate counters were also covered with plexiglass partitions and had additional details about the airline's new safety protocols.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider.

Social distancing placards dotted the carpet and continued into the jetway. United had done a great job of ensuring multiple layers of precautions here.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Before boarding, gate agents reminded passengers that wearing masks are now part of federal law and they'd be required to be worn at all times, except when eating and drinking. A refusal could mean denial of boarding and civil penalties.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Digital signage above the gate also explained the airline's new boarding procedure and additional social distancing measures.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

The flight was then boarded from the back of the plane to the front to help with social distancing. Pre-boarding was still offered and first class flyers along with United elites were still allowed to board first.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

More placards lined the jetway and though passengers rarely adhere to the six-feet rule in the jetway, the placards serve as a nice gesture to show the airline is being proactive during the pandemic.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider

Flight attendants welcomed us on the flight and gave us a sanitary wipe to clean the seats.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

The cabin, however, appeared spotless already.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

United, like most US airlines, disinfects aircraft via "fogging" with an electrostatic sprayer before each flight.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Read More: Delta, United, and American are 'fogging' their planes to make them safe for travel amid coronavirus — here's what that means

I had no concerns whatsoever with cabin cleanliness. It also helped that this was essentially a brand-new plane as no paying passengers had flown on it since March 2019.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

The back-to-front system also appeared to work worked as there were not many passengers I had to walk past, except in first class and the first few rows of economy where United elites were sat.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider.

My seat, 30A, was a window seat towards the back of the plane and I was among the first to board.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider

I found my seat to be impeccably clean, rendering the wipe virtually useless.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Even the tray table was spotless; although, that's par for the course on a "new" aircraft like this one.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

This aircraft, in particular, has no seat-back screens and United had removed all the literature beyond the safety card.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Flight attendants once again stressed the importance of mask-wearing during the pre-departure briefing. United has banned over 600 passengers as of mid-January for not wearing masks, the second most of any US airline that shared its statistics with Insider.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider.

Read More: Airlines have banned more than 2,500 passengers for not wearing masks — here are the carriers that have booted the most

Soon enough, we were off on our two-hour journey to Houston.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Flight attendants began the in-flight service shortly after takeoff, armed with masks and gloves. Not all airlines require their flight attendants to wear gloves during the service, surprisingly.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider.

Each passenger was given this snack bag, as is the case on most US airlines still conducting an in-flight service.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Inside were the essentials including a bottle of water, Stroopwafel, pretzels, and another sanitary wipe.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

And it didn't stop there as we were also offered a soft drink. I was pleasantly shocked as this was the first time I'd be given something other than plain water while flying during the pandemic.

Flying United Airlines during the pandemic.      Thomas Pallini/Insider

It was a nice touch and I was glad to see a semblance of normal. Plus, the Stroopwafel is among my favorite in-flight snacks.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

I took a quick walk around the cabin to see how well United's warnings about mask-wearing were heeded by the passengers.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

All in all, the strict warnings did appear to work as most were masked up during the flight.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

The most egregious offense I saw was not having the mask over the nose but that was rare.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider.

It was truly a normal flight with no major issues.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

Soon enough, it was time to land in Houston.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

United often deplanes by rows but we didn't on this flight. Many passengers were rushing to make connecting flights as we'd been slightly delayed leaving Denver.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider.

Overall, it was an enjoyable flight and made me want to fly United again.

Flying on a United Airlines Boeing 737 Max 9.      Thomas Pallini/Insider

United is my new favorite to fly during the pandemic that isn't blocking middle seats. I'll always prefer an airline like Delta that is blocking seats but United takes the cake among those that aren't.

I was highly impressed with how both airports I visited were completely overhauled with new health and safety measures, as well as the airline's use of its digital signage to convey social distancing messaging.

I also appreciated the airline bringing back the in-flight service, which makes quite the difference on longer flights. United is the first airline on which I've flown during the pandemic where I've been given something to drink other than a bottled water, and I truly appreciate that.

United isn't perfect as smaller airports in the airline's network do not have the same level of precautions as the Denver and Houston hubs, as is the case for many airlines, but it's better than most airlines on which I've flown during the pandemic.