The ServiceList transaction set returns a list of all applicable ancillary services that meet request qualifiers and flights. The message supports shopping for additional a la carte services to compliment any selected offer as well as shopping for specialty service items not generally included in an initial offer, but rather based on service search filters (for example, sports equipment specialty baggage and unaccompanied minor fees). The message also returns multi-media content at the message level and media references at the individual service level.