AirTran or SWA folks can always jumpseat on DL int'l flight. Plan to be at the ticket counter about 3 hours before dept, but no less than 90 minutes before dept for TSA req'r. For DL, they have to list you, and then you need to be issued a "flight coupon"- basically it's a 0 charge on your credit card in lieu of the real ticket. Sometimes the ticket counter outside security can do it, sometimes you have to go to the customer service center inside the E concourse. Go to flightinfo.com, do a search for Delta International jumpseat, and you should see lots of help there.

You will not be able to clear custom with the crew, but to be honest, it was never the hard part. Customs/airport security over in Europe is much more easier/quicker than in the US any time of day. The hard part is getting the gate pass from the non-airline affiliated employee.

When you go thru the security checkpoint, be sure you do not take your shoes off, or they'll laugh at you cuz they know you're American...