Airport data: public domain

web\flight.js draws Dallas/Fort Worth International (KDFW) from its airport file, and web\core.js puts
its runway 17C, and Zurich's runway 14 (LSZH), where they are on the earth. Their numbers come from:

  OurAirports, runways.csv and airports.csv (https://davidmegginson.github.io/ourairports-data/),
  retrieved 2026-11-01: KDFW's seven runways (each end's position, elevation, true heading and
  displaced threshold, each runway's length and width), the field's elevation, and LSZH's runway 14.
  OurAirports' data are in the public domain. The numbers were copied by value; no file is included.

  The FAA's airport diagram AL-6039, Dallas-Fort Worth Intl, d-TPP cycle 2611, effective 29 October to
  26 November 2026 (https://aeronav.faa.gov/d-tpp/2611/06039ad.pdf): KDFW's five terminals, its two
  central terminal ramps and its three control towers, read off the chart and placed by its runways.
  A work of the United States government, in the public domain (17 U.S.C. section 105). The chart
  itself is not included.

  As methods, not copied: the FAA's Advisory Circulars 150/5340-1 and 150/5340-30 for the runways'
  markings and lights, and ICAO Annex 10, Volume I, for the ILS's geometry.

The heights of the terminals and towers, the generic taxiways, the ILS on every runway (a 3 degree glide
path, 50 ft over the threshold) and the PAPIs are this project's. Nothing here is fit for navigation.