>>>Clinton allegedly flew on a US Shuttle flight... but he and entourage were the only passengers.
Nope, it was Al Gore, while being sitting Vice President - giving that particular flight the callsign Executive 2:
On February 2, 2000, a bill that would stop abortion protesters from being able to avoid paying fines by filing for bankruptcy was on the Senate agenda. Very shortly before the actual vote, it became clear that there might be a tie, requiring the Vice President to cast the tie breaker. Apparently, the USAirways Shuttle was the fastest way to get from NYC to WAS asap.
Btw, a couple of Republicans voted for the bill in order to prevent Al Gore from getting the press coverage which might have helped him in the election race.
On the Nixon flight: In order to promote the recently introduced 55 mph speed limit, Executive 1 cruised at a lower than normal speed - which resulted in more fuel burn. Great example for a political ploy backfiring.
>>>Heads of state do not have passports, nor likely do other high officials.
This is not correct. Recently, there was media coverage of German Chancellor Schroeder having trouble getting into Lybia because of a lack of visa. On a state visit, no less...