Your link shows what we spent...not whether it was enough or not....and judging by reports of Obama era airmen stripping parts off one plane to fix another we were not spending enough....
We have always stripped parts off of one plane to keep another flying, that did not start under Obama. I spent 5 years with a Marine FA18 squadron and we always had a "hanger queen" that was the plane used for parts, that practice is as old as planes.
We do not have a shortage of money in our military ,we have misuse and mismanagement.