Hi. In Canada, take off isn't only used for planes. When it is used for planes, it refers to the plane speeding down the runway and leaving the ground. It also is used to refer to removing your clothes before going to bed, for example. In Canada, it's also used to mean 'to leave' or 'to go away.' "It's been great having dinner with you but I have to take off as I have some homework to do." If you don't take off, I'm going to hit you."
Cheers