Narrative:

The day began with a maintenance delay. In ZZZ XXX radio issued us a hold for release clearance about 15 minutes prior to departure. I read the clearance back and wrote down 'hfr' at the bottom of my clearance.once bag loading was complete we started engines taxied; and took off. After takeoff XXX radio called us and asked if we had departed. We then realized we had not gotten ATC release. Nothing further.keep the pacing normal; no need to rush.develop a technique to remind you that you do not have takeoff clearance.on the next leg we also had a hold for release clearance and I put the checklist between the throttles to remind me and verbally repeated 'hold for release' on every radio call on CTAF frequency.

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Original NASA ASRS Text

Title: Air Carrier flight crew reported taking off without an ATC clearance. Captain reported having not flown in 6 months.

Narrative: The day began with a maintenance delay. In ZZZ XXX Radio issued us a Hold For Release Clearance about 15 minutes prior to departure. I read the clearance back and wrote down 'HFR' at the bottom of my clearance.Once bag loading was complete we started engines taxied; and took off. After takeoff XXX Radio called us and asked if we had departed. We then realized we had not gotten ATC release. Nothing further.Keep the pacing normal; no need to rush.Develop a technique to remind you that you do not have takeoff clearance.On the next leg we also had a Hold For Release clearance and I put the checklist between the throttles to remind me and verbally repeated 'Hold For Release' on every radio call on CTAF frequency.

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.