Air carrier flight crew reported the ATC tower changed hours of operation and was closed due to covi...

Attributes
ACN	1738408
Time
Date	202003
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Private Flight Crew Multiengine Flight Crew Commercial Flight Crew Instrument
Experience	Flight Crew Last 90 Days 126 Flight Crew Total 2399 Flight Crew Type 2399
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 109 Flight Crew Total 7841 Flight Crew Type 7841
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

Narrative:

Scheduled flight from ZZZ to ZZZ1. Tower was closed for operations due to covid-19. We both followed procedures for closed tower; by making calls in the blind and contacting ZZZ TRACON for clearance and for departure time/permission there were multiple scheduled pushbacks at xa:45. The captain briefed pushing back a few minutes early if possible to help alleviate congestion in a non-tower environment. We pushed and taxied to the hold short and called TRACON we were ready for departure. TRACON released us. I asked TRACON to clarify we were cleared to takeoff and they replied yes we were. We took off and departed uneventful following noise abatement procedure. After airborne; we discussed that we had departed several minutes before xb:00. ZZZ 10-7 page states no departures xp:00-xb:00L. After obtaining release from TRACON and verifying we were cleared to takeoff from ZZZ we realized that we had taken off several minutes prior to xb:00 once we were airborne. Other aircraft from another airline also took off before xb:00.

Original NASA ASRS Text

Title: Air carrier flight crew reported the ATC Tower changed hours of operation and was closed due to COVID-19; resulting in a takeoff before curfew ended.

Narrative: Scheduled flight from ZZZ to ZZZ1. Tower was closed for operations due to COVID-19. We both followed procedures for closed Tower; by making calls in the blind and contacting ZZZ TRACON for clearance and for departure time/permission There were multiple scheduled pushbacks at XA:45. The Captain briefed pushing back a few minutes early if possible to help alleviate congestion in a non-tower environment. We pushed and taxied to the hold short and called TRACON we were ready for departure. TRACON released us. I asked TRACON to clarify we were cleared to takeoff and they replied yes we were. We took off and departed uneventful following noise abatement procedure. After airborne; we discussed that we had departed several minutes before XB:00. ZZZ 10-7 page states no departures XP:00-XB:00L. After obtaining release from TRACON and verifying we were cleared to takeoff from ZZZ we realized that we had taken off several minutes prior to XB:00 once we were airborne. Other aircraft from another airline also took off before XB:00.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Air carrier flight crew reported the ATC tower changed hours of operation and was closed due to covid-19; resulting in a takeoff before curfew ended.