Narrative:

At spot 10 called and received clearance to taxi to runway 28R via B; F; hold short runway 1L. Aircraft was in motion at this point; just approaching taxiway sign that identified the taxiway on which we were rolling as B. This taxiway was in actuality a transition piece from B to a; so we ended up on a. There were no safety implications here--after the recent schedule drawdowns and furloughs; the ramp was as sparsely populated as an ethics class at company headquarters. When we realized our error we called for and received clearance to return to B via another transition piece.

Google
 

Original NASA ASRS Text

Title: A clearance from Spot 10 at SFO was incompatible with Ground Control's clearance to taxi via taxiway B and F to the departure runway.

Narrative: At Spot 10 called and received clearance to taxi to Runway 28R via B; F; hold short Runway 1L. Aircraft was in motion at this point; just approaching taxiway sign that identified the taxiway on which we were rolling as B. This taxiway was in actuality a transition piece from B to A; so we ended up on A. There were no safety implications here--after the recent schedule drawdowns and furloughs; the ramp was as sparsely populated as an ethics class at Company headquarters. When we realized our error we called for and received clearance to return to B via another transition piece.

Data retrieved from NASA's ASRS site as of April 2012 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.