A namesake was with QF till retirement. Staged through Mexico City on his last flight. He was known warmly all round the world. Coming in the early hours across the Pacific and calling up control for a clearance, the conversation went something like -
Ahh good morning , Qantas da da da, requesting clearance.
Ah . . .. Capitano Fox, you are cleared.
Thank you. Cleared for what precisely?
You are cleared to . . . ah .. . cleared to do whatever you like.