Spike maybe you should actually start at the airline first before worrying about a command ? I have seen a lot of older pilots join my airline (US regional) in the last year who have washed out in training, they just couldn't keep up. To suggest that some chieftain time will enable you a quick jet command upgrade is ludicrous, upgrade times are at about 12-18 months now anyway so it's not a long wait. The regs are black and white, you need 1000 hours in the right hand seat under part 121 operations before you are eligible to make the move to the LHS.