A.

a la carte.

AA.

AAA.

AAAE.

AACO.

AAD.

AAHOA.

AAPA.

AAR.

AARP.

AATTA.

ABA.

abacus.

abaft.

ABAV.

ABC.

abeam

ABF.

above board.

absolute monarchy.

ABTA.

AC.

ACAP.

ACAV.

acceleration clause.

access code.

accessible pedestrian signal.

accessible tourism.

ACCL.

accommodation.

accommodation ladder.

accountable document.

accountable manual documents.

accounting.

accreditation.

accrual method.

ACI.

acid rain.

ACI-NA.

ACK.

ACM.

ACMI.

ACN.

ACON.

ACP.

ACRA.

ACRISS.

acrophobia.

act of God.

ACTA.

ACTE.

active tourism.

actual flying time.

ACV.

AD.

ad hoc.

ADA room.

ADB.

add/coll.

additional collection.

add-on(s).

add-on fare.

adhesion contract.

adiabatic rate.

adjoining rooms.

ADM.

ADNO.

ADOA.

ADR.

ADS.

ADT.

ADTK.

aduane.

ADV.

advertised tour.

advance purchase rate.

adventure tourism.

ADVN.

ADVR.

AEADVE.

aerial courier.

aerospace.

aerotropolis.

AF.

AFA.

affiliate hosting.

affinity card.

affinity charter.

affinity group.

affinity group airfare.

AFT.

aft.

AFTA.

agency.

Agency Agreement, The.

agency check.

agency list.

agency manager.

agent.

agent bypass.

agent eligibility list.

Agent Reporting Agreement, The.

agent sine.

agentless booking.

agoraphobia.

agritourism.

agro holiday.

AGT.

ahead.

AHMA.

AHTA.

A.I.G. effect

air ambulance.

air boat.

air courier.

air-inclusive.

air mile.

air piracy.

air rage.

air taxi.

air traffic controller.

Air Travel Card.

air walls.

aircraft.

aircraft code.

aircraft stand.

airdrome.

AIRIMP.

airline.

airline appointed agency.

airline codes.

airline designator.

airline plate.

Airlines Reporting Corporation (ARC).

airplane.

airport.

airport access fee.

airport codes.

airport facility/access fee.

airport tax.

airport transfer.

air/sea.

airsickness.

airway.

airworthy.

AIT.

AITO.

aka.

Alberta clipper.

alcove.

alfresco.

algal bloom.

all inclusive.

alleyway.

alliance fare.

all-in.

allotment.

all-suite.

all-terrain vehicle.

aloha.

alongside.

ALPA.

alpenglow.

alphanumeric.

Alpine.

alternate distribution system.

alternate restaurant.

alternative fuel.

altiport.

altitude.

alumni rates.

a.m.

Amadeus.

AMAVE.

ambassador.

ambiance.

amendment fee.

amenities.

American plan.

AMEX, AMEXCO.

amidships.

amphibious.

Amtrak.

AMTUR.

amusement park.

AN.

anchor ball.

Anglophone.

Anglosphere.

antebellum.

antipode.

antipodean day.

ANVR.

ANZ.

AP.

apartheid.

APAVT.

APD.

APEX.

APHIS.

Apollo.

appointment.

apres-ski.

apron.

APS.

APT.

APU.

aqueduct.

aquifer.

arbiter, travel agent.

arbitrary fare.

arbitration.

arbitration clause.

arboretum.

ARC.

ARC list.

archipelago.

architectural bias.

archive.

area bank.

Area Settlement Plan.

ARINC.

ARNK.

ARR.

arroyo.

ARTA.

artesian well.

articles of incorporation.

arunk.

AS.

ASAP.

ASATA.

ASC.

ASP.

asset.

assimilation.

AST.

ASTA.

ASTA Business Number.

ASTAPAC.

astern.

asylum.

asylum seeker.

AT.

ATA.

ATAA.

ATB.

ATBP.

ATC.

ATFDS.

athwart.

Atlantic Standard Time.

ATM.

ATME.

ATO.

atoll.

ATP.

atrium.

ATS.

ATTA.

attitude.

ATV.

ATW.

au pair.

audit.

auditorium style.

aurora australis.

aurora borealis.

Australasia.

auto drop PNR.

Autobahn.

autoferro.

automated reservation system.

autorickshaw.

avail.

availability.

available room nights.

available rooms.

available seat miles.

avalanche.

average daily rate.

average length of stay.

Aviation Trust Fund.

AVIH.

AVML.

AVS.

AWOL.

AX.

AZA.

AZA-accredited.