ISTANBUL, Aug 1 (Reuters) - Turkey's banking watchdog has stopped allowing credit card payments by instalment for foreign travel, such as flights, travel agency fees and accommodation, in a step seen dealing a blow to foreign travel operators. The move, which hit airline shares and was seen as curbing foreign currency outflows, was one of two measures announced by the BDDK watchdog late on Monday, which it said were among coordinated steps to strengthen financial stability. "The logic (of the step) is 'citizens shouldn't go abroad and spend foreign currency'," he said, adding that the foreign travel sector was also being hit by increasing difficulties faced by Turks in securing tourist visas. The credit card move also had an impact on airline share prices, with Turkish Airlines (THYAO.IS) dipping 1.3% and the airline Pegasus (PGSUS.IS) dropping 2.3%. ($1 = 26.9618 liras)Reporting by Ebru Tuncay; Editing by Daren Butler and Emelia Sithole-MatariseOur Standards: The Thomson Reuters Trust Principles.

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Persons: Cem Polatoglu, shouldn't, Ebru Tuncay, Daren Butler, Emelia Organizations: Turks, Turkish, Turkish Airlines, Pegasus, Thomson Locations: ISTANBUL