link2icao.js

// ==UserScript==
// @name         Link in ICAO
// @namespace    http://tampermonkey.net/
// @version      1.0.0
// @description  try to take over the world!
// @author       You
// @match        https://server.fseconomy.net/aircraftlog.jsp*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=fseconomy.net
// @grant        none
// ==/UserScript==
/* global $ */

(function() {
    'use strict';

    $('document').ready(function() {
      const table = $('table:eq(0)')
      const home = $('table:eq(0) tbody tr td:eq(3)').text()
      const location = $('table:eq(0) tbody tr td:eq(4)').text()
      $('table:eq(0) tbody tr td:eq(3)').html(`<a href="https://server.fseconomy.net/airport.jsp?icao=${home}" target='_blank'>${home}</a>`)
      $('table:eq(0) tbody tr td:eq(4)').html(`<a href="https://server.fseconomy.net/airport.jsp?icao=${location}" target='_blank'>${location}</a>`)
    })
})();