On the same lines ... "When it comes to testing new aircraft or determining maximum performance, pilots like to talk about 'pushing the envelope.' They're talking about a two dimensional model: the bottom is zero altitude, the ground; the left is zero speed; the top is max altitude; and the right, maximum velocity, of course. So, the pilots are pushing that upper-right-hand corner of the envelope. What everybody tries not to dwell on is that that's where the postage gets canceled, too." — Admiral Rick Hunter, U.S. Navy
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