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Cryptic crosswords often use abbreviations to clue individual letters or short fragments of the overall solution. These include: Any conventional abbreviations found in a standard dictionary, such as:
A spacecraft prefix is a combination of letters, usually abbreviations, used in front of the name of a spacecraft, and its purpose is often analogous to more conventional ship prefixes. This list does not include prefixes used on rockets , rocket launches , and spaceflights .
(as a prefix:) restricted airspace: RA radio altitude or radar altimeter: RA resolution advisory In the context of TCAS: RAAS Runway Awareness and Advisory System: RAAS remote airport advisory service Rad Alt Radio Altitude Radar: RAdio Detection And Ranging RAI Radio altimeter indicator RAIM Receiver Autonomous Integrity Monitoring
Meaning: a prefix used to make words with a sense opposite to that of the root word; in this case, meaning "without" or "-less". This is usually used to describe organisms without a certain characteristic, as well as organisms in which that characteristic may not be immediately obvious.
Multiple designation systems have been used to specify United States military aircraft. The first system was introduced in 1911 by the United States Navy, but was discontinued six years later; [1] the first system similar to that used today was designed in 1919 when the US Army's Aeronautical Division became the United States Army Air Service.
This is a table of 1962 United States Tri-Service aircraft designation system with selected letter sequences and number. Two previous USAF/AAF/AAC number series are included due to their impact and partial incorporation into the tri-service system (A, B, C, F and O reset to one, but # carryover existed).
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Airline codes IATA ICAO Airline Call sign Country Comments OMN Servicios Aereos Ominia: SERVIOMNIA Mexico 2014 [1]: SEN Servicios de Aviacion Sierra: SERVISIERRA