Narrative:

During taxi out we had multiple runway changes during delay from mht to ord. We took off with flaps 1 degree data for runway 35 instead of using the flaps 2 degrees data for runway 17. I looked at the wrong data sheet during the checklist. From now on when I finally know what runway we are going to; I will throw away the data for the other runways to prevent inadvertently using the wrong data.

Google
 

Original NASA ASRS Text

Title: AFTER MULTIPLE RWY CHANGES WHILE TAXIING; AN A319 FLT CREW TOOK OFF USING INCORRECT RWY DATA.

Narrative: DURING TAXI OUT WE HAD MULTIPLE RWY CHANGES DURING DELAY FROM MHT TO ORD. WE TOOK OFF WITH FLAPS 1 DEG DATA FOR RWY 35 INSTEAD OF USING THE FLAPS 2 DEGS DATA FOR RWY 17. I LOOKED AT THE WRONG DATA SHEET DURING THE CHKLIST. FROM NOW ON WHEN I FINALLY KNOW WHAT RWY WE ARE GOING TO; I WILL THROW AWAY THE DATA FOR THE OTHER RWYS TO PREVENT INADVERTENTLY USING THE WRONG DATA.

Data retrieved from NASA's ASRS site as of January 2009 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.