Planes were briefly “flying blind” into Newark Liberty International Airport last week after a communications blackout occurred, multiple reports revealed Monday. Sources told Bloomberg the outage lasted 90 seconds on April 28 and shook up the on-duty controllers so much that some were placed on “trauma leave.

United Airlines CEO Scott Kirby said on Friday that the carrier will begin canceling 35 flights a day – or about 10% – at its Newark hub starting over the weekend due to government equipment failures and air traffic control staffing issues.