How fast is "faster than sound/burn the air" speed?

[Varyon]

Originally Posted by RyanW

If you asked me to make one, I'd call it:

1. Repairable at location of deployment.
2. Repairable at specialized facility.
3. Salvageable for remanufacturing.
4. Go throuh the pockets and look for loose change.
5. This used to be an airplane?

Personally, I was thinking something more along the lines of:

Class 0: Basic field repairs are sufficient, but having a proper technician look it over at the hangar is advised. Possibly not a formal classification (for liability purposes, formally all damage is considered to need repair at the hangar, but in practice a lot of users make do with basic field repairs for minor issues).
Class 1: Can be repaired at the hangar.
Class 2: Requires specialized facility for repairs; many organizations treat this as Class 3, below, rather than going through the time and expense of sending it to said specialized facility.
Class 3: Vehicle cannot be restored to original function. It still contains working parts that can be cannibalized to repair other vehicles, and/or it could be repurposed to a different function.
Class 4: Vehicle is sufficiently damaged to be functionally useless as anything but scrap - or perhaps as a decoy/target practice.
Class 5: Not a formal classification, but techs and users will talk about this (typically as a joke) to denote complete and utter destruction.

... which is ultimately pretty similar to your list, honestly.