Hi ETOPS,
Here's my two cents':
1) Spanair.
2) Reservation through dedicated ID reservations number (your call is low priority, so maybe a long wait) or email to Interline dept;
You get your ticket at any JK sales office (just like a regular pax) or it is an e-ticket if you provide a cc when the reservation is made.
3) You can pay any way you like.
4) Full refund of any unused tickets within three months. No penalties apply.
Last but not least, air crew get extra-crew (jumpseat) privileges in-house and on other Spanish carriers.
Hope it helps.
