After almost an entire day in the sky, a jetliner completed the world's longest passenger commercial flight. The Qantas flight from London touched down in Sydney on Friday.

Passengers were in it for the long haul, with nearly 20 hours and 11,000 miles between take-off and landing. It's something that's never been done before, leaving travelers unsure of how their bodies would react.

Andy Chevis was one of the 43 passengers selected for the experimental flight. During the flight he said, "I actually feel fantastic, I feel really well.''

Everyone, including the pilots, wore head or wrist monitors to track their health and well-being.

Dr. Tracey Sletten was a researcher on the flight.

“There might be different points throughout the flight where their alertness might change and we can see what an impact that has," she said.

Every aspect of the trip was regulated, from meal planning to lighting to exercising. Experts designed in-flight workouts that passengers took part in every few hours. Professor Corinne Caillaud said it was "to help people to adjust better when they arrive in Sydney and to reduce jet-lag on arrival.''

Two sunrises later, the plane finally touched down. A large crowd cheered near the runway.

The airline says they'll use data collected during the trip to determine whether similar international treks can or should be added to their schedule. If aviation authorities deem it safe, Qantas says more passengers could make the nonstop trip by 2023.