It's the story not the photo

Bear with me - this is a long tale. We are off soon to go on holiday to be with daughter, son-in-law and three children who are already in Spain. We're almost packed and looking forward to our journey on Saturday. 
B went to see other daughter and granddaughter yesterday whilst I finished off some work I needed to do. That daughter is also going to Spain with a family who have a disabled child and need some extra support. In the course of conversation she mentioned her flight times and it transpired we are on the same flight. Great- time to chat!
But when B came home and mentioned her seat number to me I got a bit concerned because it was our seat number too. Ten minutes later after much rustling of papers we realised that we aren't booked until Sunday!!!
We made the booking such a long while ago we had forgotten and somehow managed to transpose arrangements to Saturday. 
Thank goodness for their chat - or two very grumpy people would have had to return from a very early airport visit