PayPal Inc. has announced that American Airlines Inc. now accepts its service for ticket purchases online.

The San Jose unit of eBay Inc. has been moving aggressively since last year to put its payment system on the Web sites of numerous airlines. It was already accepted online by JetBlue Airways Corp. in New York, Southwest Airlines Co. in Dallas, and Northwest Airlines Inc. in Eagan, Minn., before it announced the American Airlines deal Monday.

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