Prior to 9/11 CASS didn't exist. As everyone knows, it came about to grant COCKPIT access. If you're NOT in CASS, you CAN still Jumpseat on offline carriers, but are restricted to the cabin. Plain and Simple.

While almost every airline out there is in CASS, there are still some that aren't. Those pilots and dispatchers are still eligible to Jumpseat on other carriers, but again, are restricted to the back.

I'll admit, sometimes it's a total pain in the rear trying to Jumpseat on offline carriers when they realize you're not in CASS, and as stated above, sometimes the gate agents don't have a clue how to list you. But it can be done, and is done everyday by folks that aren't in CASS.

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