Well a month give or take, who aside from the slot coordinators care... Just how can one board a flight with a boarding pass for a flight a month later ? What about the mantra of post 9/11, security ?
And maybe the got next month notams. Then of course theyŽd have to get biscuits with the tea.
As so often, it seems life writes the best comedy of all.
So all that would have been required would have been to place paper towels with "INOP" written on them placed on 178 of the 190 (or so) seats and call it a "business flight" to comply with that NOTAM. The three or four ot five flight attendants on that plane could easily have done that en route since there was not much else for them to do 
Good thinking - a real GA pilot indeed! One thing though, youŽd have to call AIS/OPS and change the FPL to N or G Type of ops, to cover all eventualities...