Another one not mentioned is trying to book a trip for e.g. 3 people, but only one item of hold luggage. You just can't do it, you have to add it later in an am

Another one not mentioned is trying to book a trip for e.g. 3 people, but only one item of hold luggage. You just can't do it, you have to add it later in an amend-booking. Jet2's not quite as bad, its possible but difficult.