Squarebear is correct - there are things in easijet's on-site software that can be said to actually prevent you from spotting an error in your booking. Because there is no such thing as through-booking (i.e. deliberate linkage of a chain of sectors) when you are making a booking where you transit and then get on a second flight you can get yourself into an error making what amounts to two separate bookings, all under the pressure of knowing you may complete one successfull but find the fare has risen on the second or (worse) it is full (so now you can't get to your destination). I made an error recently, the software picked up an anomaly but flashed a completely misleading pop-up message. I have pointed out the problem (which I verified by repeatedly part-making the same booking) but easijet have not seen fit to reply. The error cost me £65 - nice little earner. I still think your sister should simply go to her flight, she is in my view highly unlikely to encounter any problem at all because, in my experience, their airport staff are actually very reasonable and frequently helpful people. This is such a small and obvious typing error that it would be extremely petty to make an issue of it (if they should notice - unlikely).