Has anybody done a real comparison of time saved on shuttles vs. commercial? I'm not talking theoretical, but more 'what happens in real life'. For example, I could show up 10 mins before departure for a shuttle flight, but I probably wouldn't, because I'd risk missing it. I could show up 30 mins before departure for a commercial flight ( at most airports most times of the day ), but I wouldn't, because I'd risk missing it.

My back of the envelope math with realistic numbers:

NY-SF (downtown to downtown)
Shuttle (HPN-OAK): Uber to heliport ( 10 mins ); wait for chopper ( 20 min ); flight to HPN (20 mins); boarding & takeoff (30 mins), flight to OAK ( 5 hrs ) ; car to downtown SF ( 35 mins ). TOTAL: 6 hr 55 min
Commercial (JFK-SFO): Uber to JFK ( 40 mins ); go through security, get to gate, board ( 1 hr ); flight to SFO ( 5 hrs ); get through SFO to get Uber ( 15 mins ); get downtown ( 25 mins ): TOTAL: 7 hr 20 mins

So that's a total timesavings of 25 mins, or about 6%.

Certainly I understand there are lots of reasons to fly private, but timesavings is a big one, and as I'm doing the math I'm wondering if the Jetsmarter 'shared private' idea really saves all that much time. Maybe better on the shorter routes?

Curious if anybody has done any real-life comparisons, and how they stack up.