Theoretically, it could fly longer because all commercial planes land with a regulated diversion and reserve fuel and never with zero fuel. As such, the answer is that it could stay more than 20 hours in the air before running out of fuel.
Get your body prepared. The day before your flight, spend some time at the gym, walking or stretching in preparation for spending 24 hours in a sitting position. Make sure you're well-rested, too – denying yourself sleep in order to be exhausted on the plane can backfire.
Remember that anything over 6 hours flying time is considered long haul, but flights of longer than 10 hours are not uncommon either. One important thing to remember is to keep your seat belt fastened at all times in case of unexpected turbulence.
Currently, the bragging rights for the longest flight in the world belong to Singapore Airlines' New York City to Singapore route. Its longest flight path, which connects Singapore's Changi Airport with New York's John F. Kennedy International Airport, 9,585 miles away, takes 18 hours and 40 minutes.
According to a review in 2022, combining data from 18 studies, the longer you travel, the greater the risk of blood clots. The authors calculated there was a 26% higher risk for every two hours of air travel, starting after four hours.
Prevention. Most people don't need to worry much about clots on short flights. But if you're already at risk for clots and you plan to take a plane trip that's longer than 6 hours, you can do a few things to avoid them. Get up and walk around every 2 to 3 hours.
The simple answer is yes, pilots do, and are allowed to sleep during flight but there are strict rules controlling this practice. Pilots would only normally sleep on long haul flights, although sleep on short haul flights is permitted to avoid the effects of fatigue.
Long haul flights must have two or three pilots on board.
If there are three pilots on board one will be the captain who flies the plane, the second will be the first officer or co-pilot. The third pilot is the flight engineer.
Hawaiian Airlines Flight HA 89 covers 8,199 km (4,427 NM) and takes 11 hours and 35 minutes to head to Honolulu from Boston. Meanwhile, the airline's A330-200 performs HA 51 to the same spot from New York JFK, taking 11 hours and 25 minutes to cover 8,020 km (4,330 NM).
The cabin can play havoc with your ears, sinuses, gut and sleep. gut problems – just accept that you're going to fart more. You can also feel more sleepy than usual. That's due to the body not being able to absorb as much oxygen from the cabin air at altitude than it would on the ground.
Jet belly: (noun) the bloated state in which your stomach inflates post-flight. Also, a very unpleasant feeling. May also make you look like you're 3 months pregnant. So how does one prevent this jet belly? Well, it all depends on what you eat on the plane.
That requirement may vary slightly between operators. While some airlines require a third pilot for flights longer than seven hours, others may extend it to 10 hours. If the flight is longer than 12 hours, a fourth pilot (second officer) is required.