Diner's near Islip McArthur Airport rec's
There are several diners "near" the airport. That is not a ringing endorsement for any of them. There are two on Rte 454 (Vet's Hwy), one of which is opposite the enterance into the airport, and another on the south service road called (I believe) the California Diner. There is also a Panera Bread not too far away, which is not table service, but serviceable if that will meet your needs.