- Coronavirus briefly grounds flights to NYC-area and Philadelphia airportsNBC News
- New York City area airports resume flights after brief halt as coronavirus causes staffing issuesCNBC
- Virus staffing issues suspend flights to NYC, PhiladelphiaThe Associated Press
- Latest developments in the coronavirus pandemic for March 21, 2020FOX 5 NY
- Coronavirus: FAA briefly suspends all flights bound for NYC, Philadelphia airportsUSA TODAY
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