Does the chaperone accompany them to airport on way home?

This depends on 1) the itinerary and 2) how necessary the teachers feel it would be for them to have the chaperone accompany them on departure. Here at Spark, we make bespoke School Group Tours which adapt to your specific school needs. So if the chaperone is needed to go with the group to the airport, then of course they will. Otherwise they will wait for the group to get on the coach to the airport to make sure all is okay.