The bill proposes funding salaries, operating expenses and other Federal Aviation Administration programs by tapping into a little-used fund with $2.6 billion that was created to reimburse airlines if the government commandeers their planes and they are damaged. The bill's sponsors, which include four of the top Republicans and Democrats on the House Transportation and Infrastructure Committee, hope that relying on the fund might make their bill more attractive than other proposals because it would limit the potential cost of dolling out paychecks.