Boeing 747-300

he ******0 features a *3 feet 4 inches (7.*1 m) longer upper deck than the −**0. The stretched upper deck has two emergency exit doors and is the most visible difference between the −**0 and previous models. Before being made standard on the ******0, the stretched upper deck was previously offered as a retrofit, and first appeared on two Japanese ******0SR aircraft. The −**0 introduced a new straight stairway to the upper deck, instead of a spiral staircase on earlier variants, which creates room above and below for more seats. Minor aerodynamic changes allowed the −**0's cruise speed to reach Mach 0.*5 compared with Mach 0.*4 on the −**0 and −**0 models, while retaining the same takeoff weight. The −**0 could be equipped with the same Pratt & Whitney and Rolls-Royce powerplants as on the −**0, as well as updated General Electric CF***0C2B1 engines.

Swissair placed the first order for the ******0 on June *1, ***0. The variant revived the ******0 designation, which had been previously used on a design study that did not reach production. The ******0 first flew on October 5, ***2, and the type's first delivery went to Swissair on March *3, ***3. Besides the passenger model, two other versions (−**0M, −**0SR) were produced. The ******0M features cargo capacity on the rear portion of the main deck, similar to the −**0M, but with the stretched upper deck it can carry more passengers. The ******0SR, a short range, high-capacity domestic model, was produced for Japanese markets; Japan Airlines operated the type with more than **0 seats on the Okinawa–Tokyo route and elsewhere. No production freighter version of the ******0 was built, but Boeing began modifications of used passenger −**0 models into freighters in ***0.