SEOUL, Feb 15 (Reuters) - Korean Air Lines (03490) will reopen code-sharing pacts with Air France (AIRF) from April 1 and Delta Air (DAL) from May 1, the three airlines said on Friday. Executives from the three airlines signed code-share agreements -- which were severed for about three years after the airline was involved in a series of crashes -- in a ceremony held in Korean Air's headquarters in Seoul. The restoration of Korean Air's ties with the two airlines was expected to give a sales boost to South Korea's flagship carrier ahead of and during the 2002 World Cup finals that South Korea and Japan will co-host from May 31 to June 30. Industry analysts said code-sharing would help Korean Air expand its customer bases in Europe and North and Latin America, home turf of the two partners. Korean Air had aimed to restore the agreements earlier, but had to shelve negotiations after the U.S. Federal Aviation Administration (FAA) downgraded South Korea's safety standards rating to Category 2 last August. The FAA restored Korea's air safety rating, based on International Civil Aviation Organisation safety standards, to Category 1 in December. Korean Air shares were up two percent at 12,750 won by 0108 GMT, while the benchmark stock index (KS11) was down 1.08 percent.