6) I didn't check in online before my outward flight. Can I still check in online for my flight home?

TUI flights
Yes, you'll still be able to check in online for your return flight, or you've got the option of checking in at the airport. You'll be able to use online check-in from 72 hours before your flight.

The same service is also available for the following airlines: 
Air Europa, Albastar, ASL Airlines France, ASL Airlines Ireland, Evelop Airlines, Germania, Norwegian, Travel Service, Volotea.
You'll need access to a printer so you can print out your boarding passes. You'll need to print each boarding pass clearly on an individual piece of A4  paper. Alternatively, if you can't print your boarding passes, you can collect them from the TUI bag drop desk or at the check in desk of your airline when you arrive at the airport.

Click here to access online check-in.