I am "commuting" to my office in NYC tomorrow via UA 3537 (ETA 8:21am ET), taking the AirTrain to Penn Station, and then the 123. According to Google Transit, if I catch the 8:40 AirTrain I should arrive at 9:42.
Given all this info, how many full minutes before (negative) or after (positive) 10am ET will I walk in the first floor front door? If I arrive between 9:41:01 and 9:42:00 according to my phone, this market will resolve to -18.
I am a brisk walker, I'm travelling solo, I have no checked bag, and I plan to make no side stops (except maybe a bathroom). My phone, so far as I know, is using accurate GPS time.

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Cross-check complete, door’s closed. Gotta go dark for a bit. See you on the other side 😄
At the gate, +1 large coffee and breakfast sandwich. Looks like it’ll be a pretty empty flight. All indications for an on-time and quick boarding.
At the airport - FlightStats is showing on-time departure: https://www.flightstats.com/v2/flight-tracker/UA/3537


