US President Donald Trump flew for the first time on Wednesday aboard a retrofitted Boeing 747 that he accepted as a gift from Qatar.The luxury aircraft, reported to be worth about US$400 million, officially joined the Air Force One fleet last month.It had to undergo extensive modifications at US taxpayers’ expense, including security upgrades, before being cleared for use.Trump used it to fly to North Dakota to visit the new Theodore Roosevelt Presidential Library.Trump accepted the jet in...