Narrative:

While on the gate we received an ACARS message that we would need to extend our [out of duty] time if we were going to continue the flight. We responded and said we would extend our [out of duty] time. We received an ACARS message that our new [out of duty] time is xa:12z. We continued the boarding process and then pushed off the gate at time xw:24Z. We taxied to runway 18L for takeoff. We sat there for 5 minutes and then got cleared for takeoff. On the takeoff roll we received an ACARS message which we did not responded to because that is a critical phase of flight. After we were airborne we pulled up the ACARS message and it said that if we were not off the ground by xw:12Z we would need to return to the gate. My concern is that those are two contradicting messages. One says our [out of duty] time is xa:12Z the other says if not off by xw:12Z return to the gate. I personally think that our [out of duty] messaging system or process needs to be looked at.

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Original NASA ASRS Text

Title: B737 Captain reported the flight crew did not receive an important message via ACARS from the company until airborne.

Narrative: While on the gate we received an ACARS message that we would need to extend our [Out of Duty] time if we were going to continue the flight. We responded and said we would extend our [Out of Duty] time. We received an ACARS message that our new [Out of Duty] time is XA:12z. We continued the boarding process and then pushed off the gate at time XW:24Z. We taxied to Runway 18L for takeoff. We sat there for 5 minutes and then got cleared for takeoff. On the takeoff roll we received an ACARS message which we did not responded to because that is a critical phase of flight. After we were airborne we pulled up the ACARS message and it said that if we were not off the ground by XW:12Z we would need to return to the gate. My concern is that those are two contradicting messages. One says our [Out of Duty] time is XA:12Z the other says if not off by XW:12Z return to the gate. I personally think that our [Out of Duty] messaging system or process needs to be looked at.

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.