The nozzles of planes should be animatable by using the arguments 89 and 90 (Nozzle shutters right/left engine).
These args could be used to close (0) and open (1) the exhaust nozzles.
Using several maps should be possible too.
A dark map inside, for the closed nozzles (AB off), a light one for open nozzles (AB hot).
Btw. the cones for the animated AB flame can be animatable scaled.
So you need only one cone, small-sized at (0) increasing to 100 % at (1).