Yes ask!. .. .I post this every now and again, but its true! I personally got a jump seat landing on a flight from India to the UK in December. I didn't bother asking on the way out, and on the return I thought I'd try my luck. It worked. The Captains justification was along the lines of "I've been flying for 30 years......". .. .This was an aircraft belonging to a well known UK airline, and as such, was on the G- register.. .. .Why not ask? They can only say "no". (Which of course is more likely).. .. .Good luck.