2 DIFFERENT PERCEPTIONS OF WHAT MAY HAVE BEEN AN ALT EXCURSION PRIOR TO XING THE ROPPR FIX ON THE TRALR RNAV 1 DEP FROM LAS VEGAS; NV.

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OUR PDC WAS THE TRALR RNAV 1 DEP; WITH A CLRED ALT OF 7000 FT. AS WE SWITCHED OVER FROM LAS TWR TO LAS DEP; WE GAVE OUR ALT LEAVING AND OUR CLRED ALT OF 7000 FT. DEP REPLIED; 'MAINTAIN 7000 FT.' JUST PRIOR TO ROPPR (SID; AT OR BELOW 7000 FT) THEY CLRED US TO 8000 FT. WE CROSSED ROPPR AT 7000 FT AND THEN CLBED TO 8000 FT; AND THEN WE WERE CLRED DIRECT TO TRALR. ON A MORE RECENT FLT TO ORD; AS BEFORE WE WERE GIVEN 8000 FT JUST PRIOR TO ROPPR; BUT GIVEN AN UNRESTR CLB TO FL190 AFTER ROPPR. IT APPEARS DEP CTL; RESTATING 'MAINTAIN 7000 FT' WAS HIS ACKNOWLEDGEMENT TO OUR CALL; AND WAS NOT MEANT TO CANCEL THE SID ALT RESTRS. SUPPLEMENTAL INFO FROM ACN 605794: WE WERE LEVELING AT 7000 FT WHEN THE CAPT MISTAKENLY ACCEPTED A CLB CLRNC MEANT FOR ANOTHER ACFT. THE CTLR CORRECTED THE CAPT AND TOLD US WE NEEDED TO MAINTAIN 8000 FT. WE STARTED A CLB TO 8000 FT APPROX 2 MI PRIOR TO ROPPR. THE TRALR 1 REQUIRED THAT WE CROSS ROPPR 'AT OR BELOW 7500 FT.' WE CROSSED ROPPR ABOVE THE ALT REQUIRED ON THE SID.