system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When airplanes takeoff, why does the pilot tip the plane right and left?
gpt
Runways are pointed in fixed directions, and an airport might only have 2-3 pairs.  That gives 4-6 directions where you can take off.  Alas, the wind can blow in any direction.  Runways are carefully engineered to cover the most popular wind directions, but there are probably more than 6 "popular" directions.  When you take off in a different direction than the wind, called a cross-wind takeoff, it's necessary to turn the plane to the wind direction.  Passengers don't like to feel pushed to the side, the plane is too cozy already, so the tip compensates for the sideways turn motion.  Once the plane's in the right direction, it has to tip back or it would start to roll.