single
solo
to say or show that (something) may not be true, correct, or legal;
challenge
a person who flies an airplane, helicopter, etc.
pilot
an exciting or dangerous experience
adventure
not afraid, very brave
fearless
a small usually yellow or green tropical bird that is often kept in a cage
canary
very brave, having or showing courage
courageous
strange, unknown, or difficult to understand
mysterious
very famous or well-known
legendary
the height of something (such as an airplane) above the level of the sea
altitude
state of being free: such as
freedom