MD80 FLT CREW EXCEEDS 7000 FEET ON LAS 3 DEPARTURE AS THEY HAVE INSERTED 9000 FEET IN THE ALTITUDE ALERTER. FATIGUE AND FLEET DIFFERENCES IN THE ALERTER ARE CITED AS POSSIBLE FACTORS.

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AFTER CLBING OUT ON RWY 1R IN LAS WE WERE HANDED OFF TO LAS DEP. HE GAVE US STANDARD TA'S THAT ARE HEARD EVERY DAY. WE HAD A TA INDICATING THAT SOMEONE WAS 4 MI AWAY; 2000 FT ABOVE US; WHICH IS NOT UNUSUAL. ATC THEN ADVISED US TO MAINTAIN 7000 FT; WHICH WAS OUR ORIGINAL DEP CLRNC ALT. WE WERE AT 7400 FT AND TRIED TO CORRECT BACK DOWN; BUT HAD 9000 FT IN THE ALT SELECTOR AND WERE CONFUSED. WE WERE NOTIFIED THAT WE SHOULD CONTACT DEP CTL WHEN WE COULD TALK ABOUT THE POSSIBLE DEV. THERE WERE SOME ISSUES THAT LED UP TO THIS EVENT. OUR ORIGINAL DEP CLRNC WAS 7000 FT WHICH WE GOT WITH OUR CLRNC FROM CLRNC DELIVERY IN LAS. AS A CREW WE DO NOT KNOW WHY BUT AT THE TIME OF THE ISSUE WE HAD 9000 FT IN OUR ALT SELECTOR. AFTER WE TOOK OFF WITH THE PROPER TKOF CLRNC; TWR ISSUED US ANOTHER TKOF CLRNC; WHICH WAS MEANT FOR THE PROCEEDING ACFT. TWR REALIZED THE MISTAKE AND HANDED US OFF TO DEP WITH THE INSTRUCTIONS 'TURN 090 DEGS DIRECT TRAILER; AND RESUME TO DEP; CONTACT DEP.' HE POSSIBLY COULD HAVE GIVEN US 9000 FT ON THE ALT AS WELL; BUT WE HIGHLY DOUBT IT DUE TO THE FOLLOWING EVENTS; AND BELIEVE THAT IT WOULD BE UNUSUAL FOR TWR TO DO THAT. THERE WAS A LITTLE CONFUSION ON OUR BEHALF WITH THE MULTIPLE TKOF CLRNCS; BUT THEN CONTACTED DEP. FOR SOME REASON; WHEN CHKING IN WITH DEP; I INDICATED THE ALT LEAVING; 3500 FT AND CLBING TO 9000 FT; BUT DON'T KNOW WHY THAT ALT WAS STATED OTHER THAN THAT IT WAS THE ALT IN THE ALT SELECTOR AND THAT WAS 9000 FT. THIS WAS NOT CHALLENGED BY ATC. IT COULD HAVE BEEN BUMPED BY ACCIDENT; SELECTED BY MISTAKE WHEN THE HDG OF 090 DEGS WAS GIVEN OR SOMETHING ELSE. ON THE GND OUR ALT SELECTOR STATED 7000 FT AND WE CHK IT MULTIPLE TIMES THROUGHOUT THE TAXI AND PRE-TAXI PROCS. PRIOR TO REACHING 7000 FT WE WERE GIVEN TA AND OUR HEADS WERE OUTSIDE LOOKING FOR TFC WHEN WE VACATED 7000 FT; BUT FELT FOR SOME REASON THAT WITH 9000 FT BEING READ BACK THAT FOR SOME REASON IT WAS OK. WHEN ATC INFORMED US TO RETURN TO 7000 FT IT WAS OBVIOUS THAT IT WAS NOT OK. POSSIBLE REASONS FOR THE SITUATION WERE; FIRST AND FOREMOST; PLT FATIGUE. BOTH PLTS WERE WORKING LATE OR HAD WORKED LATE THE PREVIOUS NIGHT. MYSELF; THE PREVIOUS NIGHT; HAD WORKED OVER 1530 MINS OF DUTY AND 820 MINS OF FLT TIME WITH POOR SLEEP. I WAS ON RESERVE AT XA00 THAT MORNING WHEN THE ISSUE TOOK PLACE. I HAD 10 HRS OF SCHEDULED REST; AND EXPRESSED TO OUR SCHEDULES THAT IT WAS GOING TO BE ANOTHER LONG NIGHT PUTTING US AT 15 HRS OF DUTY. THEY THEN STATED THAT THERE WAS NO ONE ELSE TO DO THE TRIP. THE CAPT STATED THAT HIS ORIGINAL TRIP WAS SUPPOSED TO DEPART EARLY BUT WAS PUSHED BACK THROUGHOUT THE MORNING AND HIS START TIME WAS CHANGED THROUGHOUT THE MORNING. IT IS MY TRUE BELIEF THAT THIS PRACTICE OF CONTACTING CREW MEMBERS PRIOR TO THEIR START TIME TO CHANGE IT TO A LATER TIME IS CAUSE FOR PLT FATIGUE AND WILL LEAD TO AN ACCIDENT. ALSO; IT IS MY BELIEF THAT 16 HRS OF DUTY IS UNSAFE. I BELIEVE IT SHOULD BE LESS BY THE COMPANY OR BY THE FAA. HE WAS READY TO BE AT WORK EARLY AND HE WAS LOOKING AT OVER 13 HRS OF DUTY AT THIS POINT AND WAS LOOKING TO FINISH HIS SHIFT VERY LATE; WHICH MAKES FOR A REALLY LONG DAY. ANOTHER POSSIBLE REASON IS THAT OUR ALT SELECTOR KNOBS HAVE DIFFERENT FUNCTIONS IN DIFFERENT AIRPLANES. SOME YOU ROLL IN THE ALT THEN PULL THE KNOB TO SELECT THE ALT. OTHERS; THE TYPE WE HAD; CAN HAVE AN ALT KNOB ROLLED WITHOUT BEING PULLED TO SELECT THE ALT. THIS COULD HAVE LED TO THE ALT BEING BUMPED OR CHANGED DURING THE NEW ASSIGNED HDG OR WHEN THE AUTOPLT WAS ENGAGED. STANDARDIZING THIS KNOB AND OTHER SWITCHES WHICH FUNCTIONS ARE DRASTICALLY DIFFERENT FROM ACFT TO ACFT CAN IMPROVE CRM AND STANDARDIZATION. ANOTHER; IS THAT IF WE INCORRECTLY STATED AN ALT; AND THAT ALT WAS NOT CHALLENGED ON OUR INITIAL CHK-IN WITH DEP. AGAIN; I DO NOT KNOW WHY 9000 FT WAS STATED BUT IT WAS AND WAS NOT CHALLENGED. 9000 FT COULD HAVE BEEN GIVEN TO US BY THE TWR BUT I CANNOT SAY FOR SURE. I BELIEVE THAT THE TA'S ALSO DIVERTED OUR ATTN; THE INCORRECT TKOF CLRNC CAUSED AN UNDUE DISTRAND ALARM. THE ADVISORIES ARE NECESSARY BUT THE TIMING OF THOSE WAS NOT GOOD.