What size carry on bag is allowed on a plane at JFK airport?

At JFK Airport, the size allowance for a carry-on bag generally follows the guidelines set by individual airlines, but most allow a bag measuring up to 22 x 14 x 9 inches (56 x 36 x 23 cm). It's important to check with your specific airline for their carry-on policies, as size restrictions may vary. Additionally, travelers are typically allowed one personal item, such as a backpack or purse, that fits under the seat in front of them.