Why 'cab' and when?
In the crew-room the other day, one of our number asked why military helicopters were sometimes referred to as 'cabs'. Someone else opined that only Naval helicopters were referred to thus, and a third party said that he'd also heard the Sea Harrier (RIP) so described.
Can anyone say a) when this usage came in b) where the reference came from and c) to which military aircraft is it usually applied?