SEVERAL FLTS ARE FLOWN IN A C750 WITH AN UNNOTICED MISSING LAVATORY DOOR. THE ACFT WAS JUST OUT OF HVY MAINT AND THE FLTS INVOLVED INCLUDED IOE TRAINING.

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THE MISSION WAS TO PICK UP A CITATION X FROM A CESSNA CITATION SVC CTR AND POS IT FOR A PAX FLT ON THE NEXT MORNING. I WAS ALSO TO CONDUCT A 1ST TRAINING FLT; FOR AN FO'S IOE. THIS WOULD BE HIS FIRST EXPOSURE TO THE BACK OF THE CITATION X. THE ACFT WAS NOT AVAILABLE TO THE CREW UNTIL ABOUT AN HR LATER THAN IT WAS SUPPOSED TO BE. THE STOCK OF SUPPLIES ONBOARD; IE; PAX SNACKS; PLAYING CARDS; BOTTLED WATER; LAVATORY SUPPLIES; ETC; WAS NEARLY DEPLETED. WHILE PERFORMING THE RESTOCK; POINTING OUT WHERE EACH OF THE ITEMS BELONG; AND PREFLTING THE AIRPLANE; IT WAS NOT NOTICED THAT THE LAVATORY DOOR WAS MISSING. THE FACT THAT THE DOOR HAD BEEN REMOVED; WAS NOT ENTERED IN THE ACFT MAINT LOG. THE DOOR IS NORMALLY OPEN AND IT IS NOT OBVIOUS AS A PERSON LOOKS AFT IN THE CABIN. WE WERE DISPATCHED WITH THE LAVATORY DOOR MISSING AND FLEW 2 FERRY LEGS AND A PAX LEG WITHOUT THE DOOR INSTALLED. ON A SECOND PAX LEG; THE FO ASKED HOW THE LAVATORY DOOR WORKED? THIS WAS WHEN IT SUDDENLY OCCURRED TO ME THAT I DID NOT NOTICE THE DOOR DURING THE PREFLT. THE COMPANY WAS PROMPTLY NOTIFIED AND THE ACFT WAS GNDED UNTIL THE MISSING DOOR COULD BE LOCATED; SHIPPED TO THE ACFT AND INSTALLED BY OUR OWN MECH. THE MAIN PROB IS THAT THE AIRPLANE HAD FLOWN SEVERAL LEGS WITHOUT A PROPER MEL ENTRY FOR THE MISSING DOOR. I ALLOWED MYSELF TO BE DISTRACTED FROM THE INSPECTION OF THE AFT CABIN. CONTRIBUTING FACTORS: NORMAL TIME ALLOWED TO RECEIVE AN ACFT FROM MAINT; 90 MINS. NORMAL TIME ALLOWED TO PREFLT WITH AN IOE PLT; 90 MINS. TIME ALLOCATED ON THIS PREFLT; 90 MINS. TIME THAT SHOWED BE ALLOCATED ON COMBINED MISSION; 120-150 MINS. ADDITIONAL DISTR CAUSED BY INSUFFICIENT STOCK ONBOARD ACFT.