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Term Definition
M Booking class - use varies depending upon airline
M&M Miles & More (Lufthansa Group FFP - more commonly known atM&L- Miles & Less!
Mag Magnetometer, more accurately known as a Walk-Through Metal Detector
Mainline A reference to aircraft run by United proper rather than the commuter lines. Generally the larger multi-class planes.
Matron Airline employee, often middle-aged woman, who polices access to business and first class lounges.
Mattress Run The practice of checking into a hotel or a series of hotels, just to earn status credits and/or points in that hotel chain's frequent lodger program
MCE Main Cabin Extra(coming soon) some coach rows with extra legroom, sold for an extra fee or allocated to Elites
MCLA Mexico, Caribbean and Latin America
MCO Miscellaneous Charges Order, paper issued by the airline for a ticket refund, etc. Not to be confused with MCO, the code for
MCT Minimum Connection Time
MD or Mad Dog McDonnell Douglas 88 or 90
Medallion Qualification Mile A unit of measurement used towards the qualification of elite Medallion status for the next year, earned only by actually being a passenger on an aircraft operated by Delta Air Lines or its partners, by using an approved credit card, or by special promotions.
Medallion Qualification Segment A unit of measurement used towards the qualification of elite Medallion status for the next year, earned only by actually being a passenger on an aircraft operated by Delta Air Lines or its partners.
MEL Minimum Equipment List (list of equipment allowed inoperative not affecting flight safety)
MEMBERSHIP PRIVILEGES Special privileges granted by airlines and hotels to members of frequent travel programs. For example, hotels may offer discounted rates or free nights to program members for a limited time.
METAL Refers to aircraft (thus metal) of the airline you are flying. (i.e., Delta metal, American metal, etc...).
MFU Miles For Upgrade (now referred to as Upgrade Using Avios)
MH Malaysia Airlines
MHC Mile High Club
MHD Mexican Hat Dance, a type of mileage run between Canada and Mexico
MIB Merchandise in Baggage
Midcon Flight that flies mid-continent, e.g. ORD-JFK or DFW-LAX
MIL Military Passenger
MILEAGE JUNKIE A frequent flyer who obsessively accumulates miles and points, and often does not redeem many awards.
MILEAGE MANIAC See MILEAGE JUNKIE.
MILEAGE PURCHASE The capability to purchase a certain percentage of miles needed to redeem a specific award.
MILEAGE RUN A series of flights taken in a very short amount of time, solely for the purpose of accumulating frequent flyer miles, with a blatant disregard for the destinations.
Million Miler A person who has earned a minimum of 1,000,000 Medallion Qualification Miles.
MINIMUM MILEAGE Minimum number of miles earned by a program member, regardless of the length of the flight; usually 500 miles.
MLL Maple Leaf Lounge - Air Canada's network of Elite and VIP airport lounges.
MM Million Mile Fliers- Not a bona-fide status level. Folks who fly 1,000,000BISmiles are given permanent 1P status without need to qualify.
MMB Manage My Booking
MMW MillimeterWave portal (aka "electronic strip-search machine")
Moat Nickname for Security Checkpoint
Moat Dragon A TSO manning a WTMD, MMW or BSX machine.
MOL Michael O'Leary
MOML Moslem Meal/ Halal Meal (not available on all flights)
MP Mileage Plus - United's name for their frequent flyer program
MP MoneyPak
MPM Maximum Permitted Mileage. Many tickets especially RTW have a maximum number of miles permitted under the fare.
MQD Medallian Qualifying Dollars; Delta lingo for minimum spend
MQM Medallion Qualifier Miles, miles that count towards achievement of Elite status on Delta
MQS Medallion Qualification Segments, used to determine your qualification for elite status
MR Marriott Rewards
MR Mileage Run - A series of flights taken in a very short amount of time, solely for the purpose of accumulating frequent flyer miles, with a blatant disregard for the destinations.
MR is also used as an abbreviation for American Express Membership Rewards.
Mr. Easy Chicken, Easy Chicken, Mr. Chicken Various terms for the Easy Check-in kiosks in airports.
Mr. Pillows A character in a story of unknown veracity who has a seemingly endless supply of pillows available on UA.
MRO Maintenance, Repair & Overhaul
MRTC American's "More Room Throughout Coach"
MS Manufactured Spending
MS Egyptair
MSC Most Significant Carrier (important for baggage and some ticket issues)
MTEU Miles Towards Elite Upgrades (for earning 500 mile upgrades, etc.)
MTOW Maximum Take Off Weight (aircraft)
MU China Eastern Airlines
MUA Mileage Upgrade Award (an upgrade award using miles)
MX Maintenance
MX Mexicana de Aviacion OR flight canceled/delayed due to mechanical problems