Hello,

I have been curious about this for awhile and finally decided to ask the question: why are runways at some airports that were once a certain length seem to have "shrunk", i.e. are now shorter than they were before? And I don't mean runways that were purposely shortened, such as runway 03-21 at PDX (was formerly 7,000 feet long and was shortened to 6,000 feet when runway 10L-28R was extended), but runways that are listed as being, in most cases, just a few feet shorter than they once were. Here are some examples, and they are all airports that I have flown into/out of and I know for a fact the runways were longer than they are now "officially" listed on FAA approach plates/airfield diagrams:

TUL: Runway 18L-36R, used to be 10,000 feet, now listed at 9,999 feet (a whopping 1 foot shorter, but still...)

HDN: Runway 10-28, used to be 10,000 feet, now listed as 9,998 feet (were the other 2 feet stolen?)

AEG: Runway 04-22, used to be 7,400 feet, now 7,398 (a difference of 2 feet), and Runway 17-35, previously 6,000 feet, now "only" 5,993 (seems that 7 feet of runway have disappeared).

I know the FAA conducts periodic safety/operational inspections on airports, and during the process, do they go out and measure the length of runways to validate the charts/airport diagrams? Is is possible a runway is now officially a few feet shorter because of deterioration of the pavement at the ends and therefore a foot or two of that pavement is no longer considered load bearing, and therefore is unusable? Any information is appreciated.

Thank you!