SUM is the Airport Code of Agana in Guam.
"SUM" in the context of travel, transport, and hotels could mean different things depending on the context in which it is used. Below are a few examples:
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In the context of hotels, "SUM" might refer to a summary or a total of the number of guests staying in the hotel at a particular time. For example, a hotel might have a SUM of 100 guests staying in the hotel on a given night.
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In the context of transportation, "SUM" might refer to a summary or a total of the number of passengers on a particular flight, train or bus. For example, an airline might have a SUM of 200 passengers on a given flight.
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In the context of tours, "SUM" might refer to a summary or a total of the number of tourists on a particular tour. For example, a tour operator might have a SUM of 50 tourists on a given tour.
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In the context of airfare, "SUM" might refer to a summary or a total of the number of seats available on a particular flight.
It's important to note that "SUM" could be used in many different ways and that the context of the conversation would help to understand the meaning of the term. In general, "SUM" refers to a summary or a total of something.