I just booked a flight for four relatives (in-laws actually) on Air Plus Comet, a Spanish charter carrier. Not much information is available online, but I've found a few reviews. The flights were about $450 round trip JFK - MAD, about half the cost of what was available on other airlines. So we booked them "sight unseen". It seems that they fly an Airbus 310 into JFK at about 2:30 PM on Friday, then fly it back out at about 6:00 PM the same day. Fortunately, my family's schedules were flexible so 3 of them are staying 2 weeks, and the other 4 weeks, (Friday-Friday of course).

Do any FTers have any experience or comments about this airline?

Thanks