Agree, PPL can help a lot. But so can the 'Irish charm'! Tried it with Aer Arann, PPL in hand and a big old Irish grin and they put me up there from CRZ down to gate in Edinburgh. Fandabidozy!!
Also remember its usually possible to get a quick chat and a peek when on the ground (provided their turnarounds not too tight). Easyjet to London Gatwick last week, A319, quick looksy and a natter with the flight crew before heading down to baggage. Just try your luck mate!!!
ETC