Luton-Belgrade. It's like a game know the rules in advance. Check to see everything your going to be charged for before you pay. Always pay the £4 each way fee for extra leg room unless you are under 5 foot 4 tall it's so worth it. The hold baggage allowance is generous at 32kg but you pay for it but hand luggage is free and therefore closely watched so don't get greedy with either the size of the bag or weight (it's 10kg max). The planes are new cabin crew are polite but obviously trained to try and sell as much as they can during the flight. Ground staff were okay and overall had a pleasant trip. Only downside is Luton Airport I was embarrassed. I will pay the £3 in future to go through the priority security check I queued for 20 minutes last time not a school holiday and it was 7am! Disgraceful.