We are a public transportation agency, and one of our bus routes travels between Morgantown, WV and Pittsburgh, PA with a total of 6 stops and this route runs twice daily.

We are looking for a shopping cart that will allow a rider to purchase a ticket from one location to another on a specific day, and specific trip.  Each bus has 22 seats and we don't want to overbook.  For instance if a rider chooses to travel between point A and point C then that seat will be taken out of inventory for that trip (A to C) plus A to B and B to C.  Imagine an airplane that stops in Chicago and some get off and some stay on, those seats would be reserved for the whole trip while other seats would only be reserved up until the Chicago stop.

It's a little different than a hotel reservation, we could make each bus a different hotel with 22 rooms (seats) but then we wouldn't be able to split the "night" up into the different trip sections.  Therefore the hotel reservation carts won't work.

 I'm looking for a shopping cart that will fulfill these needs, any suggestions would be helpful.

 Thank you,
Maria