There are 41 massive C-17 airplanes stationed at Joint Base Charleston which sits just across the Ashley River from Magnolia Plantation, where I take many of my photos. I’ve seen them coming and going many times, sometimes singly and sometimes in groups.
A few weeks ago when I was on the dike three of them flew in together and circled around a few times before landing.

Circling is a long process for these giants, and they give the illusion of being awfully close together.

It was five minutes from the time I first spotted them until they dipped below the trees to the runway.

From Boeing’s website, the C-17:
Wingspan to Winglet Tip 169.8 ft (51.74 m)
Length 174 ft (53.04 m)
Height at Tail 55.1 ft (16.79 m)
Compare to a Boeing 737
Wingspan 117 ft 5 in (35.8 m)
Length 110 ft 4 in (33.6 m)
Height 41 ft 3 in (12.5 m)