Narrative:

Flight from sfo to ZZZ departing from runway 01L intersection M. Received and acknowledged position and hold instructions from the tower; taxiing on the runway requested takeoff checklist which was completed and acknowledged; confirmed the correct runway and stated clear for takeoff which was triggered by the landing lights being on. Began and completed the takeoff. During climb out tower indicated the need for us to call them and provided a number. After arriving in ZZZ we placed a call and spoke with someone who asked us to call back and speak with a quality control specialist. We made that call; left a message and he returned our call later and informed us we had departed without takeoff clearance. He confirmed this by allowing us to hear the tapes. He also told us that no conflict with other aircraft had occurred.fatigue may have had some influence. Rest periods between duty have been ok. The time zones and the early morning get up may have had an effect. As a crew we placed a great focus on using and becoming comfortable with new triggers; flows; checklists and responses that have been recently introduced. I believe trying to comply and respond properly along with an old trigger may also have contributed to our error. The more familiar these new procedures become the less direct focus will be necessary and they will become the tool they were meant to be.

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Original NASA ASRS Text

Title: Fractional jet flight crew reported a departure from SFO without a takeoff clearance.

Narrative: Flight from SFO to ZZZ departing from Runway 01L intersection M. Received and acknowledged position and hold instructions from the tower; taxiing on the runway requested takeoff checklist which was completed and acknowledged; confirmed the correct runway and stated clear for takeoff which was triggered by the landing lights being on. Began and completed the takeoff. During climb out tower indicated the need for us to call them and provided a number. After arriving in ZZZ we placed a call and spoke with someone who asked us to call back and speak with a Quality Control Specialist. We made that call; left a message and he returned our call later and informed us we had departed without takeoff clearance. He confirmed this by allowing us to hear the tapes. He also told us that no conflict with other aircraft had occurred.Fatigue may have had some influence. Rest periods between duty have been ok. The time zones and the early morning get up may have had an effect. As a crew we placed a great focus on using and becoming comfortable with new triggers; flows; checklists and responses that have been recently introduced. I believe trying to comply and respond properly along with an old trigger may also have contributed to our error. The more familiar these new procedures become the less direct focus will be necessary and they will become the tool they were meant to be.

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.