The distribution method of choice by the airlines is the travel agency. The 131. commissions due travel agents on business delivered. Business Review Request Letter: American Society of Travel Agents Inc. (ASTA). (According to the American Society of Travel Agents, the average service fee for booking airline tickets in 2009 was around $20, while the fee for booking a cruise was $50. And Angie‚Äôs List reports the fee for a…