I've just checked in for a friend and his wife who are going from EMA to Tenerife with Jet2. They chose their seats for them 29A and 28E. On the plan 28F was still free, why didn't they put him in that seat so they could sit together?
The answer probably is that he would have to pay to change his seat from 29A to 28F so he could sit with his wife. He is a very tight fisted chap and left his seats as they chose for him. Hard luck Jet2 you didn't get the extra £9. It would have gone towards getting some newer planes.