Airline Predatory Pricing Prevention Act of 1993 - Amends the Federal Aviation Act of 1958 to require the Secretary of Transportation (Secretary) to investigate allegations that an air carrier has engaged in predatory pricing in the provision of air transportation in a city-pair market and to order, in the significant likelihood that one of two specified predatory pricing indicators exists, such air carrier to cease and desist from engaging in the alleged pricing until the conclusion of a full investigation or 90 days after such order, whichever occurs first. Sets forth civil penalties for failure to obey such order.