But what evidence is there that the shortage was caused by those 'DEI' policies? For example, in 2013 the FAA Academy was shut down for most of the year (April - December) due to the sequester. They had planned to hire more than 1300 controllers that year but hired fewer than 600.

Additionally, part of the changes that brought along the biographical questionnaire had another major change: they opened up positions to the general public--meaning a candidate didn't need to go through one of the college-affiliated programs anymore. However, that also meant that people had to find their way through the on-boarding process, which at least initially was not well developed and many candidates failed to complete the necessary steps to move the process along.