Berlin Tegel Airport continued operating its daily non-stop Tegel–JFK service until Delta Air Lines assumed most of Pan Am's transatlantic scheduled services during 1991. Pan Am Express, which was not included in Pan Am's IGS sale to Lufthansa, continued operating all of its domestic and international regional scheduled routes from Tegel as an independent legal entity until its acquisition by TWA in 1991. Following TWA's takeover of Pan Am Express, the former Pan Am Express Berlin operations were closed. Until December 1994, Lufthansa also contracted Euroberlin to operate some of its internal German flights from its new Tegel base, making use of that
Airport city logically combined elements that reinforce each other. Services and facilities are designed to guide travelers easily through the airport process. Access is key for passengers, cargo, businesses, and residents, many of whom work in the airport city. "Time" has named it as one of "10 ideas that will change the world". The chapter "The Way Forward" from "Global Airport Cities" describes the basic airport city drivers, which have evolved with different spatial forms predicated on available land and ground transportation infrastructure: The most common airside and landside airport city commercial activities include: duty-free shops and airline lounges; restaurants, catering, and