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Both of these are special cases of a preorder: an antisymmetric preorder is a partial order, and a symmetric preorder is an equivalence relation. Moreover, a preorder on a set X {\displaystyle X} can equivalently be defined as an equivalence relation on X {\displaystyle X} , together with a partial order on the set of equivalence class.
A miscellaneous charges order (MCO), also known as miscellaneous purpose document (MPD), [1] is an accountable IATA document, similar to an old-style airline ticket, used to process the payment of travel arrangements. They are issued by airlines, but normally pay for services other than airfares.
The airline accounting code, or prefix code, is a 3-digit number, referenced by IATA and unique among all the airlines, used to identify the airline in various accounting activities such as ticketing. For instance, Lufthansa Cargo (LH/GEC) has been assigned 020 [4] as accounting code, and all the flight tickets issued by that airline start with ...
This is a list of all airline codes. The table lists the IATA airline designators, the ICAO airline designators and the airline call signs (telephony designator ...
This is a list of all airline codes. The table lists the IATA airline designators, the ICAO airline designators and the airline call signs (telephony designator ...
Besides these two most common order types, brokers may offer a number of other options, such as stop-loss orders or stop-limit orders. Order types differ by broker, but they all have market and ...
Novak Djokovic, right, of Serbia is congratulated by Jiri Lehecka of the Czech Republic, left, after their fourth round match at the Australian Open tennis championship in Melbourne, Australia ...
A fare basis code (often just referred to as a fare basis) is an alphabetic or alpha-numeric code used by airlines to identify a fare type and allow airline staff and travel agents to find the rules applicable to that fare. Although airlines now set their own fare basis codes, there are some patterns that have evolved over the years and may ...