Most flights from LaGuardia go to locations inside the United States and Canada. Some flights also go to Aruba, the Bahamas, and Bermuda, which have United States Department of Homeland Security preclearance services. The airport has ICE/CPB facilities to deal with customs and immigration for international flights but they cannot deal with a large number of passengers at one time. LaGuardia is the busiest airport in the United States without any non-stop flights to and from Europe. Nonstop flights to or from LaGuardia are limited to only . This does not include flights on Saturdays and flights to Denver. Because of this most flights across the continent and international flights use JFK or Newark.