President Donald Trump’s pick to lead the Federal Aviation Administration says the air traffic control system needs “massive upgrading” and he will prioritize its modernization if confirmed to the role.

President Trump’s nominee to lead the Federal Aviation Administration was grilled by senators Wednesday on critical safety-related issues, including the required hours needed for pilots, the outdated air traffic control system and the ongoing problems at Ronald Reagan Washington National Airport.

President Trump’s nominee to lead the Federal Aviation Administration vowed to hold Boeing Co. accountable for the quality of its jets as the U.S. plane maker works to produce its cash-cow 737 Max aircraft at higher rates.