| Rank | Abbreviation | Meaning |
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| ***** | DIRECT FLIGHT | Any flight between two places that carries a single flight number. Unlike a nonstop, a direct flight will make one or more stops between the two places. The passenger may have to change planes or even
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| ***** | DIRECT SPENDING. | In the tourism industry, any money that goes directly from a tourist's pocket into the local economy. See also, indirect spending.
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| **** | DIRECT BOOKING. | When a passenger purchases a trip with a supplier, especially a cruise line, without the involvement of a travel agent. See also, direct book.
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| **** | DIRECT MAIL. | 1. A form of marketing in which sellers offer their products or services to buyers by mail, instead of (or in addition to) through agents or stores. 2. A form of advertising in which sellers promote t
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| *** | DIRECT BILLING. | System in which a corporation's travel agency bills employees for their business travel. The employee must then submit an expense accounting and be reimbursed by the corporation.
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| *** | DIRECT ACCESS. | System or program that gives the user the capability of tapping directly into a vendor's computer system to get last-minute information about seat or product availability.
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| *** | DIRECT MIDREX | Direct from Midrex
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| *** | EUR PHYS J DIRECT | European Physical Journal Direct
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