FH
The AAC and and RN don't really have career aviators
Not quite true, once you become NCO Aircrew in the either the RN or Army you will stay as such and will fly for most if not all your career, the same applies to most RN Officers and some AAC Officers.
You'll do time in the ranks before selection to aircrew
True.
Then you'll fly for a bit and eventually be returned to the ranks again
Not true.
This is especially true of the RN
Not true Crewman have a career path and their own Branch
The AAC seem a bit more flexible for NCO pilots who may continue to fly their whole career.
True.