Narrative:

After lax ground control granted us pushback clearance from gate; they advised us to plan for runway 25R. Having already planned and briefed for runway 24L; the first officer (first officer) requested 24L; but lax ground control denied the request. After the before taxi checklist and prior to taxi; the first officer and I reprogrammed the FMC; briefed the runway 25R particulars and completed the departure plan checklist. Upon requesting taxi clearance; lax ground control advised us to plan for runway 24L. Again; the first officer and I reprogrammed the FMC and re-briefed the runway 24L particulars and re-ran the departure plan checklist.when we requested taxi again; lax ground control gave us 'taxi to 24L via delta 8; echo. Prior to turning right onto taxiway echo; tower cleared us for takeoff. We completed our takeoff flows and I called for the before takeoff checklist. During the taxi; I will note it was very dark and there were no center line taxiway lights. The only lights illuminated were the runway 24L threshold approach lights and the runway center line lights. During the takeoff roll; the first officer realized we were departing from intersection victor (the point of approach threshold lighting) and not the full length from echo 6.the first officer stated the discrepancy; but by the time I recognized the discrepancy; we were rapidly approaching 80 knots. Given the runway length from intersection victor was greater than 10;500' and our takeoff weight was exceptionally low due to a light fuel load and [comparatively few] passengers; I elected to continue the takeoff.

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Original NASA ASRS Text

Title: B737 pilots reported taking off from the incorrect ATC assigned clearance position.

Narrative: After LAX Ground Control granted us pushback clearance from Gate; they advised us to plan for Runway 25R. Having already planned and briefed for Runway 24L; the FO (First Officer) requested 24L; but LAX Ground Control denied the request. After the Before Taxi Checklist and prior to taxi; the FO and I reprogrammed the FMC; briefed the Runway 25R particulars and completed the Departure Plan Checklist. Upon requesting Taxi Clearance; LAX Ground Control advised us to plan for Runway 24L. Again; the FO and I reprogrammed the FMC and re-briefed the Runway 24L particulars and re-ran the Departure Plan Checklist.When we requested taxi again; LAX Ground Control gave us 'Taxi to 24L via Delta 8; Echo. Prior to turning right onto Taxiway Echo; Tower cleared us for takeoff. We completed our Takeoff Flows and I called for the Before Takeoff Checklist. During the taxi; I will note it was very dark and there were no center line taxiway lights. The only lights illuminated were the Runway 24L threshold approach lights and the runway center line lights. During the takeoff roll; the FO realized we were departing from intersection Victor (the point of approach threshold lighting) and not the full length from Echo 6.The FO stated the discrepancy; but by the time I recognized the discrepancy; we were rapidly approaching 80 knots. Given the runway length from intersection Victor was greater than 10;500' and our takeoff weight was exceptionally low due to a light fuel load and [comparatively few] Passengers; I elected to continue the takeoff.

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.