Still working — heavy queries on the fallback index can run 20-40 seconds.
C.F.R.
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Title 14
» CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER J—NAVIGATIONAL FACILITIES › PART 170—ESTABLISHMENT AND DISCONTINUANCE CRITERIA FOR AIR TRAFFIC CONTROL SERVICES AND NAVIGATIONAL FACILITIES › Subpart B—Airport Traffic Control Towers