Dao had already boarded United Express Flight 3411 from Chicago to Louisville, Kentucky, on Apr 9 when staff asked for volunteers to give adult their seats to United employees who indispensable to be in Louisville a following day. United offering in sell income and a hotel voucher. When no one volunteered, even after some-more income was offered, staff incidentally comparison 4 people to remove, including Dao.
Article source: http://www.huffingtonpost.com/entry/united-no-federal-punishment-david-dao_us_59b1b73de4b0b5e53104fb45?section=us_travel