Cessna LC-126 (N1010D)

The archive is JetPhotos; the copyright owner is the well-known Jon Proctor. https://www.jetphotos.com/photo/6984490

What a fabulous shot Gary, from perhaps the early to mid '50s? Looks like a North Central DC3 in the foreground. A Northwest DC4 to the left, TWA 749 Connie in the distance and with a Martin across to the right with her ventral stairs deployed.

From the 60's at least

N1010D is reg to a C-195 "Businessliner"
N15598 is reg to a 1940 Douglas DC-3-201D

N1010D is the first aircraft the original Midway Airlines in Chicago purchased brand new from Cessna in 1950.