15) Can I choose my seat on the plane if I'm not flying with TUI?

You'll be able to choose seats if you've been given a separate flight booking reference by your airline and the operator has "Select your Seat" available. You'll be able to do this whilst you're checking in online.

Just so you know, some airlines only allocate seats and boarding passes when you check in. In this case, we recommend you check-in as early as possible.

If you're not sure who you're flying with, take a look at "Which airline am I flying with?"