The Familiarization (FAM) program was something that the FAA was trying to kill for years, 9/11 finally gave them an excuse.
How the program worked was you would have to fill out a FAM request form, you then were given say 3 days comp time to travel on your FAM trip. There was an office that coordinated reserving you the jumpseat for your FAM. Upon completion of the FAM you would have to write a report to hand in to your supervisor. That was the proper and intended way to use the program. We were all issued a cockpit access card (some of the pilots on here might remember them) that we carried as part of the ID process.
Many controllers (myself included) would also "flash and dash" ... meaning we would just show up, Gov't ID and access card in hand, and jumpseat to go somewhere. That was always dicey... the key was talking to the Captain, most gate agents just labeled you as "FAA" and many pilots were iffy about having FAA in the cockpit. Once they knew you were a controller everything was cool.
I thought it was a really good program... I learned a lot from it. I flew back from LAX one night in a AAL DC10, the Capt and FE were real old timers, they had a junior FO and me. School was open ... the captain explained every single thing from the walk around to pulling into the gate in JFK. Those are learning experiences that you can only gain in that situation.
There is always talk about us getting the program back... we will NEVER get it back in the capacity that we had it, that simply won't happen. We might see something where you're released from operational duties for a day to "training" where you do a back and forth FAM trip to observe a flight crew. As for the "flash and dash" I'm doubtful...