Got an extended flight deck visit on an easyJet 737 on Sunday coming back from Barcelona to Liverpool - not much room to "sit" more "perch" but both flight crew v. enthusiastic to discuss career path, how the 737 flight deck works, flying in general, etc (and I'm only 6 hours toward my PPL). Even got a wave of acknowledgement across the baggage reclaim afterwards. Achieved this with a short typed letter to "the Captain" handed to crew on boarding. Good luck!