A callable product is a unit of capacity sold to self-selected low-fare customers who willingly grant the capacity provider the option to "call" the capacity at a prespecified recall price. We analyze callable products in a finite-capacity setting with two fare classes where low-fare customers...

A flexible product is a menu of two or more alternative, typically substitute, products offered by a constrained supplier using a sales or booking process. The supplier reserves the right to assign customers who purchase a flexible product to one of the alternatives at a time near the end of the...