Jet2 may lose bookings as well if they don't improve the online check-in facility, especially regarding the seating. I mean, either include the "seating selection" fee from the start for those choosing online check-in, or seat the damn people together.
Why on earth would the first people to check-in (a family) be allocated 35AB & 35DE? Yeah, at least 2 seats are together and they are in the same row, but is still a bit ridiculous. It's been happening constantly and it's not funny at the airport check-in. Plus, for those checking-in at the airport there's virtually no seats together left either to allocate.
Yes, they could all pay to pre book seats together. But it's not very costumer friendly if you ask me.