ETA
Estimated Time of Arrival

ETD
Estimated Time of Departure

RT
Round Trip

OW
One Way

B&B
Bed and Breakfast

TSA
Transportation Security Administration

LCC
Low-Cost Carrier

PNR
Passenger Name Record

IATA
International Air Transport Association

LGA
LaGuardia Airport (example of an airport code)

DOA
Date of Arrival

DOD
Date of Departure

CWT
Carlson Wagonlit Travel (travel management company)

CRS
Central Reservation System

DND
Do Not Disturb

GDS
Global Distribution System

API
Advance Passenger Information

APIS
Advance Passenger Information System

VFR
Visiting Friends and Relatives

FIT
Free Independent Traveler

FAM
Familiarization Trip (often organized for travel agents)

DMC
Destination Management Company

PAX
Passengers

RMS
Rooms (often seen in hotel bookings)

WTM
World Travel Market