Eh? Your Cessna 172 isn't doing Mach 1. It's certainly possible to open the door at any speed a light aircraft can achieve. The door/canopy my get ripped off,

Eh? Your Cessna 172 isn't doing Mach 1. It's certainly possible to open the door at any speed a light aircraft can achieve. The door/canopy my get ripped off, but that's kind of irrelevant.