Pan American World Airways, most commonly known as "Pan Am", was the principal international airline of the United States from the 1930s until its collapse in 1991. Originally founded as a seaplane service out of Key West, Florida, the airline became a major company; it was credited with many innovations that shaped the international airline industry, including the widespread use of jet aircraft, jumbo jets, and computerized reservation systems. Identified by its blue globe logo and the use of "Clipper" in aircraft names and call signs, the airline was a cultural icon of the 20th century, and the unofficial flag carrier of the United States. Pan Am went through two incarnations after 1991. The second Pan Am operated from 1996 to 1998 with a focus on low-cost, long-distance flights between the U.S. and the Caribbean. The current incarnation, based in Portsmouth, New Hampshire and known as the Pan Am "Clipper Connection", is operated by Boston-Maine Airways. The airline currently flies to destinations in the northeastern United States, Florida, Dominican Republic, and Puerto Rico.