What is the rate of climb of a fully loaded Boeing 737-800? A heavy -8 might get 1300–1500 fpm initially, dropping to around 1000 fpm or less approaching optimum altitude for the weight. That's at max take off gross weight.
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The standard aircraft departure climb gradient (CG) is 200 feet per nautical mile. This value is designed to provide 48 feet of clearance at one nautical mile from the departure end of the runway (DER).
For example, a commercial airliner may have a rate of climb of around 1,500 ft/min during cruise, while a military fighter jet can climb at a rate of up to 20,000 ft/min. During takeoff, the rate of climb can be even higher, with commercial airliners typically climbing at around 2,500-3,500 ft/min.
So a heavy B-737-400, e.g., 119,000 pounds, has a minimum maneuvering speed of 180 knots, at flaps 10?. To fly any slower would require that the landing gear be extended prior to any flap setting greater than 10? of flap being selected (or the gear warning sounds continuously and cannot be silenced).
The most common reason is that there are no airstrips or airports on many of the small islands, so if a plane had to make an emergency landing, it would be difficult to find a place to land. Additionally, the Pacific Ocean is vast and remote, so if a plane were to go down, it would be very difficult to find.
All these climb rates seem very, very slow. After takeoff & clean up, you should be aiming for 3000-4000fpm until 1000. From 10000 to 20000, as you speed up, you should be somewhere from 2500 (even 3k) to 2000fpm. Towards the cruise altitude, climb speed can be anywhere from 1500 to 500fpm.