Assuming she had simply stayed the night in another room with other friends, Natalee's roommates gathered up her belongings - luggage, purse, cell phone, and passport, bringing them down to the now crowding lobby in preparation for their flight home. As the bus began to load, adults began to ask questions of the seniors as to why the missing Natalee might not be there. Her friends stated that she had left Carlos and Charlies with a local boy.
It was decided that the students and 6 of the 7 chaperons for the trip would go on to the airport so as to not miss their flight back home. Many of the chaperones were veterans of the trip as it had become almost a ritual having been undertaken without incident for the past five, or so years. The remaining chaperone, who was not my source for this story, kept her belongings, including cell phone, in case she turned up at the hotel.
From:
http://www.riehlworldview.com/
SW..see #529