MCID request indicators

           8  7  6  5  4  3  2  1
        1  H  G  F  E  D  C  B  A
        bit
        A               MCID request indicator
0               MCID not requested
1               MCID requested
        bit
        B               Holding indicator (national use)
0               Holding not requested
1               Holding requested
        bits H-C        Spare