THE FLC OF AN S80 QUERIES THE GND CTLR REGARDING THEIR TAIL CLRNC FROM THE HOLD LINE AND RWY NEAR RWY 10 AND TXWY E AT MSY; LA.

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LOCATION: RWY 10 AND TXWY A; PRE TKOF. WE WERE HOLDING SHORT OF RWY 10 FULL LENGTH WITH A WHEELS UP TIME OF XA07Z. 2 PLANES (B737 AND A LEARJET) TAXIED BEHIND US THAT NEEDED TO TAKE OFF BEFORE WE COULD. TWR INSTRUCTED US TO TAXI ONTO RWY 10 EBOUND AND EXIT AT TXWY A HOLDING SHORT OF TXWY E SO THAT ANOTHER B737 COULD TAXI BY US ON TXWY E TO FULL LENGTH RWY 10. WE FOLLOWED TWR'S INSTRUCTIONS AND HELD SHORT OF TXWY E ON TXWY A. AS WE STOPPED; WE QUESTIONED WHETHER THE TAIL OF OUR PLANE WAS ACROSS THE HOLD SHORT LINE. WE TOLD TWR THAT WE WERE NOT SURE ABOUT THIS SIT. TWR TOLD US THAT IF WE WERE PULLED UP TO TXWY E THAT WE WERE OK. THE CAPT OPENED THE WINDOW AND LOOKED BACK TO SEE IF OUR TAIL WAS OVER THE LINE BUT COULD NOT TELL. 2 PLANES TOOK OFF OF RWY 10. THE WBOUND B737 TAXIED BY US AND TWR CLRED US TO TAXI BACK TO FULL LENGTH RWY 10 ON TXWY E. AS WE TURNED THE CORNER AND LOOKED BACK (NOW THAT WE COULD SEE THE HOLD SHORT LINE) WE BOTH AGREED THAT OUR TAIL WAS PROBABLY OVER THE HOLD SHORT LINE WHEN THE 2 PLANES TOOK OFF OF RWY 10. SUPPLEMENTAL INFO FROM ACN 511837: THERE WAS NO PART OF MY ACFT WITHIN 100 YARDS OF THE RWY; BUT THE HOLD LINE IS PAINTED FAR FROM RWY EDGE. RWY 10 IS A CAT II RWY; BUT I SAW THE MARKINGS AS A RWY SAFETY AREA HOLD LINE AND NOT AS A CRITICAL AREA HOLD.