Berlin Tegel Airport used the airport as a diversion airfield before. Initially, all British Airways services from Tegel—with the exception of the daily non-stop service to London Heathrow—continued to be operated by BAC One-Eleven 500s. The daily London–Heathrow non-stop was operated with Hawker Siddeley Trident 2E/3B equipment based at that airport until the end of the 1975 summer season. (It subsequently reverted to a One-Eleven 500 operation.) From 1983, British Airways began updating its Berlin fleet. This entailed phasing out the ageing One-Elevens, which were replaced with new Boeing 737-200 Adv. During the second half of the 1980s, British Airways augmented its Berlin
Detroit Metropolitan Airport the county expanded the airport to become Detroit's primary airport. It renamed the facility Detroit-Wayne Major Airport in 1947, and in the next three years expanded threefold as three more runways were built. In 1949, the airport added runways 3L/21R and 9L/27R, followed by runway 4R/22L in 1950. In 1946–47, most airline traffic moved from the cramped Detroit City Airport (now Coleman Young International Airport) northeast of downtown Detroit to the larger Willow Run Airport over west of the city, and west of Wayne County Airport. Pan-Am (1954) and BOAC (1956) were the first passenger airlines at Detroit-Wayne Major. In