A system whereby airlines are permitted to exchange tickets for goods or services provided to the airlines. Many problems still need to be worked out with the process, including how a resale market for bartered tickets may be controlled in some manner so as to protect consumers and carriers alike. Many carriers are of the opinion that unlicensed and unregulated firms may become involved in the distribution process, possibly leading to some form of a “black market” in the resale of bartered tickets.