In case you missed it in the article, the report is at
He spent $15,112.50 to go to a meeting at Trump Tower, probably with two other guys on the NYC bound flight only. I don’t know if this includes the car to National and the car from LaGuardia to Trump Tower. His car to National probably started at his house in Massachusetts Heights DC.
Perusing the photos kind of pictures the whole zeitgeist he lives in.
Anyway, three business class seats on the Acela to NYC would have cost $456. (He probably returned alone.) From Union Station to Penn Station three hours. The total travel time on the Acela would be less than the $15,112.50 flight. Union Station is half as far from Mnushkin’s house as National airport, and Penn Station is 14 minutes by subway ($2.75) from Trump Tower, or a 34 minute walk for free. Obviously he would have hailed a cab for maybe $10. LaGuardia is about a 45 minute drive to Trump Tower or of course a lot longer given traffic.