Consider the following sets of dialogue.
From Temple of Doom:
Willie: No one's flying the plane!
Indy: Oh, boy...
Willie: They've all gone! You know how to fly, don't you?
Indy: No. Do you?
Willie: Oh, no. Oh, my god!
Indy: How hard can it be?
From Last Crusade:
Indy: Come on, Dad. Come on!
Jones Sr.: I didn't know you could fly a plane.
Indy: Fly, yes. Land, no.
So on to my question. When did Indy learn to fly a plane? Are we meant to understand that he's learned to fly since the events of Temple? Or are we meant to understand that due to the events of Temple, he now has a basic working knowledge of how to fly a plane?