Transit
ESTA Transit can also be defined as a stop on the journey. This is a stop at an airport to refill fuel or food before the flight returns to its final destination.
International flights usually transit for between one and two hours. These cases require passengers to stay inside the plane or transfer to an airport transit area. During transit, the aircraft’s interior must be cleaned. If you leave the aircraft, move all personal items from your feet to the overhead compartments. Keep your passport, and other valuables close, even if you’re not on the plane.
Airport staff will distribute ESTA transit cards to passengers who are travelling. Although transit takes a few minutes to complete, you must keep your card safe.
Transfer
The transfer is the act or process of changing flight plans. This differs from transit because passengers can take the same aircraft to their final destination. Although “transit” may refer to the act of transferring flight in some instances, it can also be used in other cases.
Depending on the transit time or airport structure, you may need to move around the airport. Sometimes you may need a new boarding pass at the airport where your transfer takes place.
Before you depart, confirm with the airline whether there is any transfer or transit information.