When I arrived in Lonny 2 years ago for the GTBR one airport bus had a bigger open-cage trailer to take bikes. The other had the normal closed in box trailer for luggage. The buses travelled in convoy so cyclists could get their luggage and bike at the various destinations.
The drivers were keen to help, assuring everyone that they would get where they are going. I am sure the same helpful attitude will apply this time, although if you are going to arrive at a time when cyclists are not expected, then it might pay to let them know in advance. I am sure they will already be expecting a big influx on the Friday.