You don't control with fpm. If you set that, the aeroplane may only be able to maintain that climb by reducing speed, with unhappy results. You set the power and let it do its thing- you are more concerned with retracting flaps and accelerating at about 1000' or 1500'. On the Classic, we couldn't quite make Burnham out of London at 3000' (10 miles away). The 747-400, even at max weight, can do it easily. Shorthaul aeroplanes go up like a bat out of hell incomparison. I won't even describe the Learjet- I think they must have afterburners.