Names of people onboard emerge as loved ones pay tribute; Democrats say US president ‘exploiting’ collision that killed 67 people

• Alarms raised about ‘congested’ airspace before fatal Washington crash
• Staffing levels ‘not normal’ in control tower at time of crash, report says

Reagan national’s main runway is the busiest in the United States, with more than 800 daily takeoffs and landings.

The National Transportation Safety Board has investigated nine accidents or incidents at the airport this century, including two that were fatal, records showed.