I think UAL is the only US airline that still owns its own Res system. =20 Delta Air Lines sells stake in Worldspan=20 =09 Tuesday July 1, 9:37 AM EDT=20 CHICAGO, July 1 (Reuters) - Delta Air Lines Inc. (DAL <http://money.excite.com/jsp/qt/full.jsp?time=3D0&symbol_search_text=3DDA= L> ) on Tuesday said it sold its stake in travel reservations company Worldspan for $455 million in cash, credits and debt. Delta, the No. 3 U.S. airline, said it received $285 million in cash, $125 million in credits for Worldspan services over nine years, and a $45 million subordinated promissory note that matures in 2012. AMR Corp.'s (AMR <http://money.excite.com/jsp/qt/full.jsp?time=3D0&symbol_search_text=3DAM= R> ) American Airlines and Northwest Airlines Corp. (NWAC <http://money.excite.com/jsp/qt/full.jsp?time=3D0&symbol_search_text=3DNW= AC> ) also sold their stakes in Worldspan, which was purchased by Travel Transaction Processing Corp., an acquisition vehicle formed by Citigroup Venture Capital Equity Partners L.P. and Teachers' Merchant Bank.=20 =A92003 Reuters Limited.=20