AAG Achiever: Planespotting Multi-Cache

This is a short, 2-stage multi at one of our favorite places in the city, a public area operated by Dekalb County. Please note the cache is not at the posted coordinates, for obvious reasons. 

Answer the questions from the plaque on the stone at the posted coordinates to gain the final's location. Driving will be involved between the two stages. 

1). On the plaque on the stone at the coordinates, find the first two letters of the first line (part of the name of the plane) Using numbers to represent the alphabet (A=1, B=2, C=3, etc.) the first letter's numerical value is A and the second letter is B.

2). What number is listed in the plane's name (third character of first line)? This is C.

3). On the stone plaque in front of the plane, subtract the dates to get a two-digit number. This is D and E.

Final: N33 52. (D+A), (C-2), (C-B). W084 18. (B+A+D), (C+D), (E-B-C).