I don't want to sound like a broken record, but this point can't be stated enough. It is truly about who you know. As I think about the corporate jobs I've had and as I think about the friends I have flying corporate airplanes now, NONE of them were advertised - they all happened thru personal referrals and good ole' networking. Some jobs are advertised but generally speaking, the good corporate opportunities come about because of networking. It's not enough to just talk to corporate crews but make sure you actively network with them. As was said earlier, definatley don't force yourself upon them but as you're talking to the corporate guys, see if you can get their email or other contact info and try and keep in touch with them. You don't need to contact them every week but every few months or so, drop them an email.