A quick check of Flightradar24 has the LaGuardia departures atm doing a full loop over Flushing in order to reach 10,000 feet by the time they cross the Hudson, and 12,500 feet crossing right over Teterboro.
This is a flight to Houston that will pretty much follow the I-81 corridor from PA south.
The *approach* to LaGuardia though shoots right up the Hudson, but at above 5,000 feet before descending over the Bronx and Westchester. The plane directly over Jersey City in that image is JBU2088 from BNA.
Flightradar24 is so addictive to watch. DL4766 from MEM just went the length of Manhattan following 1st Avenue like an arrow at 3,225 feet (including right over the UN complex).