In landing configuration, at a heavy weight right after takeoff, airliners don't have enough power to fly level. This was a training event that was introduced to demonstrate that at heavy weights (ie immediate return scenario), even at max power you'd be unable to hold level flight while in landing configuration while single engine. Rule of thumb "no gear down until you're going downhill" (ie descent patth without level offs).[/QUOTE]
a large jet, isn’t at landing configuration at takeoff. It also is above landing weight if going far enough to change a few time zones or the weather. Thanks for your input cadet.