Thanks for the reply SoS. Definitely not a typo.
There have been a lot of cancelled flights to and from the Falklands in recent years due to a ridiculous situation where the MOD shut the joint Civ/Mil international airport at the slightest hint of turbulence in the forecast (sorry for the digression...very contentious issue locally...), and the local travel agents always refer to passengers flights being “reprotected” to another day. I have found multiple uses of it in this sense with an online search, but none that explain how the term is derived. Doesn’t make any linguistic sense to me...
Would make more sense just to say “rebooked”.