How many seats will the Cardiff-centric aircraft have ?
How many passengers are likely to be on the 6am / late evening Cityjet flight in/out of Cardiff each weekday ?
How likely are Cityjet to gain extra revenue by connecting passengers onto other long haul flights ? (clue - unlike KLM, very little)
How much does it cost to put the crew up in a hotel and feed them each night ?
Spreading the cost of the hotel/food bills across the passengers on the early morning/late evening flights at Cardiff, how much of a dent does this make in the fare passengers pay ?