I fly the LTN-ABZ route on Easyjet often, also use their Inverness-LTN. The flight is normally around 1 hour, so it matters little that you have to pay for drinks etc. BA give you very litte food wise on that route anyway (Sandwich in a bag most of the day).

They have a system of first to check-in - first to board. At check-in you are not given a seat number, you are given a boarding number instead so you choose your own seat when you board. It works very well. Check-in opens 2 hours before take off time.

They are excellent value. Yesterday I tried to book BA for an overnight trip ABZ-LHR-ABZ in February. BA price £350 v easyjet £12.00 each way. Bookings are made one way only. You need to book your outward and inward flights seperately. A plus for me as I often fly back into a different airport than I fly out of. If I have a choice I would go for BA everytime, it's the price that sways me. On saying that there is nothing wrong with Easyjet, they are VERY popular over here.

They operate 737's and have a young fleet. Luton is more awkward to get to than LHR & LGW. It doesn't have an express service like the Heathrow or Gatwick Express. You take a Thameslink train from Kings Cross Thameslink Station to Luton Parkway Station then take a free shuttle bus to the airport. If you take a taxi from Central London to Kings Cross be sure to ask the driver to take you to Kings Cross Thamelink and not Kings Cross. The two stations are close to each other however transfering involves navigating an extremely busy road. The journey time from London to Luton can take an hour in total. Trains run several times every hour. The cost of a return is around £20.00. Aberdeen Airport is around 10 minutes taxi ride from the city centre and costs roughly £7.00

I wouldn't hesitate to recommend Easyjet. No miles, no drinks however they are efficient and cheap. To get the best fares book as early as possible - booking late often brings up the same fares as BA.

Hope this helps