To the untrained eye, the departure of a pair of Delta Air Lines and United Airlines Boeing 737-900ERs at San Francisco International Airport (SFO) was a typical sight on a normal Saturday evening in late August. Closer inspection, however, would reveal something very different. The two aircraft stayed together in the pattern for almost 3 hr., conducting unusual, closely linked curved and straight-in approaches—in some cases never before seen at the airport—and performed ...


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