Comparing the space shuttle is like comparing the Wright Brothers craft to an F-16, two totally different subjects, which is what you were just telling me about comparing 4-engined A/C to 2-engined A/C. Point is well taken. Although, I do dee those 747-400s climbing fast as well.
The Concorde has four engines, but I will not compare it, because it is a different subject, like the space shuttle, so I will assume you are joking.
As with all commercial A/C, the quicker the craft can get to cruise altitude, the more efficient the flight will be in terms of saving on fuel costs. This is why on some short flights, the A/C will climb to altitude, say fl280, fly a few minutes, then begin its descent, rather than staying at fl150 the whole way. Good example: Phoenix to Palm Springs, it's a short hop that basically involves only climbing and descending. Just a few minutes are spent at altitude.
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