PhompAng

// ==UserScript==
// @name         Better Airline Club + Cost Per PAX Combined & Improved
// @namespace    http://tampermonkey.net/
// @version      1.1.2
// @description  Enhances airline-club.com and v2.airline-club.com airline management game (protip: Sign into your 2 accounts with one on each domain to avoid extra logout/login). Install this script with automatic updates by first installing TamperMonkey/ViolentMonkey/GreaseMonkey and installing it as a userscript.
// @author       Aphix/Torus (original "Cost Per PAX" portion by Alrianne @ https://github.com/wolfnether/Airline_Club_Mod/)
// @match        https://*.airline-club.com/
// @icon         https://www.google.com/s2/favicons?domain=airline-club.com
// @downloadURL  https://gist.githubusercontent.com/PhompAng/f00eb6f16aaaa5a32c9896b450fc73e0/raw/bca8ee0a256aa83f435e896df319439b8b124719/BetterAirlineClub.userscript.js
// @updateURL    https://gist.githubusercontent.com/PhompAng/f00eb6f16aaaa5a32c9896b450fc73e0/raw/bca8ee0a256aa83f435e896df319439b8b12

PhompAng

const setNativeValue = (element, value) => {
    const valueSetter = Object.getOwnPropertyDescriptor(element, 'value').set;
    const prototype = Object.getPrototypeOf(element);
    const prototypeValueSetter = Object.getOwnPropertyDescriptor(prototype, 'value').set;

    if (valueSetter && valueSetter !== prototypeValueSetter) {
        prototypeValueSetter.call(element, value);
    } else {
        valueSetter.call(element, value);
    }