Comparing the oil carried by an ultra large crude carrier with a fleet of Boeing 747 freighters requires more than matching their internal volumes. An aircraft's cargo-weight limit can prevent it from filling all its available space with oil. The tanker can use its full cargo capacity in the comparison. No final aircraft total is supplied; the example establishes the loading constraint without giving a numerical conversion.
Notable Point · 29:34-32:52
Why a 747's cargo volume cannot be compared directly with an oil tanker's
A comparison between Boeing 747 freighters and an ultra large crude carrier must account for aircraft payload limits as well as cargo space.