crash? That's the reason the air traffic controller involved in the crash was doing the work of 2 people?
https://www.foxnews.com/us/dc-plane-crash-what-know-about-mistakes-made-leading-up-fatal-collision
Reviews of the moments leading up to Wednesday’s fatal midair crash involving an Army helicopter and an American Airlines passenger jet have revealed several failures and mistakes.
In normal operating conditions, air traffic control for helicopters and planes at Reagan National Airport is handled by two operators. However, on Wednesday, the duties were combined, leaving just one person to handle both duties, The New York Times reported.
The outlet, citing a source who was not authorized to speak publicly, noted that there is usually only one air traffic controller after 9:30 PM, but a supervisor let one leave early. The midair collision that left 67 dead occurred just before 9:00 PM local time.