Availability
ATP – Average Ticket Price
ATB – Automated Ticket & Boarding Pass
ASPAC – Asia South Pacific
ARR – Average room rate
Around-the-world
ARNK – Arrival Unknown
ARC number
ARC – Airlines Reporting Corporation
Applicable fare
APEX – Advance Purchase Excursion Fare
APAC – Asia Pacific
AP – American Plan
Amtrak
Alliance
All-inclusive
Airside
Airport tax
Airport security check
Airport Lounge
Airport code
Airline Alliance
Air taxi
Agent error