[cluckindan]

The ”race tracks” are left- and right-hand traffic patterns for arriving aircraft and touch-and-go training, typically used by smaller aircraft. The polylines going from airport to the surroundings are IFR (instrument flight rules) STARs (standard terminal arrival routes) for inbound/outbound planes; each vertex in the line corresponds to a so-called navigation star which usually has a 5-letter name.

[Jtsummers]

COS's airfield is also used by PSFB so you'll see different patterns than a normal airport. You find similar patterns, though, near other military bases like here, near Pensacola and Eglin:

https://adsb.exposed/?dataset=Planes&zoom=8&lat=29.7992&lng=...