Enroute to the river cruise

I'm on my first flight which is from Houston (IAH) - New York City Laguardia (LGA)... later I will then transfer to JFK for a flight to Zurich, Switzerland. Amazingly enough I was upgraded to first class on the flight to NYC.

Delta's International Contract of Carriage pays for the transfer between the LGA and JFK airports (for international flights). See rule 30 (ground transfers), exemption #1 in Delta's International Contract of Carriage below.

https://www.delta.com/content/dam/delta-www/pdfs/legal/contract_of_carriage_intl.pdf

Below is my boarding pass for the transatlantic flight....