London Heathrow’s proposed third runway could reshape UK air travel—boosting capacity and possibly opening the door for budget carriers like easyJet. The expansion plan includes a new runway, terminal additions, and 30 new routes, nearly doubling flight capacity by 2035. easyJet’s CEO sees this as a rare chance to bring affordable fares to a top-tier hub. But environmental groups continue to challenge the project’s carbon impact and feasibility.