Aviation Common Acronyms and Time Standards

A comprehensive list of common aviation acronyms and 24-hour clock usage rules based on industry lecture notes.

7D

30 Hour Breaks (Pilots)

A/C

Aircraft

ACL

Acclimated

ACLTH

Acclimated Theatre

ACLDPS

Acclimated Duty Period Start

A/I

Air Interrupt

ADVD

Advised

ARR/ARVL

Arrive/Arrival

A/P

Airport

CKA

Check Pilot

CLR/CLRD

Clear/Cleared

CNL/CXL

Cancel

CM

Crew Member

CRW SKED

Crew Schedule

CA

Captain

CTC

Contact

DH OR D/H

Deadhead

DLY/DLYS

Delay/Delayed

DOM

Domestic

DPTR

Departure

DVTD

Diverted

ETA

Estimated Time of Arrival

ETD

Estimated Time of Departure

EQ/EQP

Equipment

FA

Flight Attendant

FDP

Flight Duty Period

FO

First Officer

FLT

Flight

FTL

Flight Time Limit

FRY

Ferry

G/I

Ground Interrupt

HTL

Hotel

INTL

International

IROPS

Irregular Operations

LMOR

Left Message on Recorder

LMTC

Left Message to Call

LOFDS

Line of Flight Display System

MIC

Misconnect, Illegality, or Cancellation

MOT

Mandatory Off Time

MTC

Maintenance

ODL

Off Duty Layover

OPS

Operation

OTS

Out of Service

PLN

Plan

RAP

Reserve Availability Period

R/A

Reassignment

RC

Relief Captain

RSKD

Rescheduled

RSV

Reserve

RLSD

Released

RMVD

Removed

RON

Remain Overnight

RPT

Report

RTD

Return to Gate

SAFA

South American Flight Attendant

SEQ

Sequence

SKD

Schedule

SOE

Substitution of Equipment

STUB

Stub Original Flight

TAFB

Time Away From Base

TRKG

Tracking

TWR

Tower

UTC (Contact)

Unable to Contact

W/U

Wheels Up

WX

Weather

24-Hour Clock Format

Uses $4$ digits: the first $2$ represent the hours, and the last $2$ represent the minutes.

Converting to 24-Hour Clock

Remove the colon and the AM/PM markers.