All trips are based on the nearest international airport and students and the trips will normally start at that point. In the case of smaller communities it would be the students responsibility to arrange transportation to the starting point of the trip unless specifically outlined on your reservation.
Flights from smaller gateways will quite often not have an S-Trip! staff on them and will generally connect in a larger hub. When possible an S-Trip! staff will meet the students at the airport and assist with their connection.