Glider pilots; you have to follow the tug (not lift the tail up and kill them), fly efficiently (stick and rudder/ needle and ball/ keeping the string in the middle), aviod hitting hills, each other at very close distances; look for more lift then land every time with no engine to bail you out if you cock it up a bit...
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"It is possible to fly without motors, but not without knowledge and skill" -Wilbur Wright