The Federal Aviation Administration (FAA) is considering measures to halt United Airlines’ expansion while regulators investigate recent safety issues. The FAA is considering temporary actions, such as restricting the airline from starting new routes and barring customers from flying on newly delivered aircraft, people familiar with the matter, who asked not to be identified to describe “closed discussions,” told Bloomberg. United planes have experienced a number of issues this month, including a flight out of Houston needing to make an emergency landing after the engine caught fire and a plan…