A US federal court has rejected the bid by an industry body of major US airlines to block $3.4 billion loan to Air India to purchase new Boeing planes. In November last year, trade body Airlines for America had filed a lawsuit against the US Exim Bank, opposing the loan guarantee to the Indian national carrier to buy Boeing 787 Dreamliners. It said that the financial support would put US carriers at a commercial disadvantage.Rejecting the request, Judge James Boasberg of the US District Court for the District of Columbia said the trade group failed to show that American carriers would suffer financial loss if the Boeing jets were delivered to Air India.Airlines for America, formerly known as the Air Transport Association of America, had filed the lawsuit on behalf of nine of its 14 members, including Delta Air Lines and Southwest Airlines.