In order to complete this cache you must complete "Vance AFB Series #1." The number you found is "Y."
All aircraft in the park have a plaque with a description and a "T-" number. One example of the T- number is T-28.
Start by adding all the numbers from the
plaques. This number is "X."
Z=X-Y-37
Find the aircraft with the value of "Z" in the tail number. For example, if you calculated 32 you would look for tail number 50325.
The cache will be with the aircraft with the value of Z in the tail number. Good luck!