Shrouded in secrecy. I am sure though that in the past a number of airlines have approached BA in respect of the big 'F'. To suceed the respective airline is audited for fiscal security and is given a number of books with the required standards that have to be achieved. In the case of Comair much of the set up work was done by BA as Comair were not 'jarops' nor were they compliant and conforming to the BA standard. It was also an outlet to offload clapped out 737's. It used to be that BA picked up about 15% of the gross of all a 'F' took and in addition charged them for all other services i.e. audits and uniforms. It seems a lot but clearly suits both parties. Didn't the 727 look good in BA colours.