text: are the c5a and 747 jets the same size?   in most respects, they're pretty close.  (details of the 747 vary by model.)  the wingspan of the 747-400er, a current model, is over 211 feet.  the wingspan of the galaxy (c-5a) is about 223 feet.  the 747-400er is about 232 feet long.  the galaxy is about 247 feet long.  the heights are about the same, at almost 64 feet for the 747-400er and about 65 feet for the galaxy.  the maximum takeoff weight for the 747-400er is 910,000 pounds; for the galaxy, it's 840,000.  boeing has announced a bigger version of the 747, the 747-8.  it will have a wingspan of almost 225 feet, a length of as much as 250 feet, and a height between 63 and 64 feet.  the maximum takeoff weight will be 960,000 pounds.  but, even though the new 747 will be definitely bigger, it still won't have the cool front-and-rear cargo ramps and a cargo bay big enough to drive a tank through, like the galaxy does.