There is a limitation if you get the type rating without actually going out and flying the jet. And no, it doesn't go away when you fly any jet. It will go away once you've completed your... Well, to be honest, I'm not exactly sure. I think it's probably your initial operating experience. Probably something like 25 hours in the real deal with an instructor who is typed on the 73. However, not many of those guys running around doing freelance work on all those 73's just sitting and waiting to be rented for 25 hours Anyways, the limitation will look something like this: "This certificate is subject to pilot-in-command limitation for B-737." Unfortunately, don't expect anyone to hire you just because you are typed in the 73. It helps, but not much. Everyone wants "500 hours on type."