Why passenger aircraft flying 33000feet?
ne odd sw even. neoddsweven. 360 degrees through 179 degrees airplane cruise @ odd altitude (ex 33,000 feet). 180 degrees through 359 degrees altitude (ex. 34,000 feet). atc can assign "wrong way" altitude. 42,000 not usable "usually".then direction changes every 2,000 feet. ex. 43,000 west 45,000 east 47,000 west 49,000 east.
jet aircraft more efficient @ higher altitudes. typically mid upper 30's produce best true airspeed while using less fuel.
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