With a capacity audience of 1,250 people in Lisbon, Portugal, left waiting, Elton John, 53, reportedly walked out on a concert Wednesday night, a mere half hour before the curtain was scheduled to go up, the show's organizers told the Associated Press. "He said he was going out to get some air," said Nuno Lima de Carvalho, a spokesman for the theater at the Estoril Casino, where the aborted concert was staged, "but then he jumped into his car and went to the airport to catch his private jet. He never said goodbye or anything to anyone." Tickets for Elton in concert were in the $200 range. Carvalho told the AP that the performer seemed concerned that the members of the audience -- including government officials and financiers -- were slow to take their seats. The venue is said to be considering legal action. Paul Carey, a London spokesman for the singer, had no comment. Last spring in New York, John reportedly walked out of a preview performance of the Broadway show "Aida," for which he had written the score. He later explained that his departure was over a disagreement he had with producers over the arrangement of his music.