In early 1991, Continental increased flights and destinations at LaGuardia airport after the shutdown of Eastern Airlines, and also increased the number of Continental Express flights and destinations at the airport. But after the end of the summer season in 1991, Continental decided to close the former PBA hubs at Boston and LaGuardia. Because some of the routes were operated under the federal Essential Air Service program, replacement service had to be obtained before the government would allow Continental to abandon some of the routes, most notably service to Martha's Vineyard, Bar Harbor ME, and Rockland, ME. An agreement was reached where Cape Air would operate year-round service between Boston and Martha's Vineyard, and Continental Express would continue to operate seasonal service from Newark to Martha's Vineyard, Nantucket, and Hyannis. Colgan Air picked up the routes from Boston to Maine. This then permitted Continental to completely close the Continental Express hubs at Boston and LaGuardia, as well as the PBA maintenance hangar and regional offices in Hyannis.