GSS
That is correct, half of any new GSS Commands must be BA Mainline secondees, who stay for a minimum of three years. A number of Capts are retired BA when the retirement age with BA was 55.
A very popular posting for BA co-pilots when I flew for GSS, not many pilots get B744 Capt. experience in their twenties in Europe.
A well run and happy outfit, although the pay could be better!, but thats the reason for the ACMI contract.