United Airlines recently surprised its MileagePlus members with the announcement of its plans to invest in future supersonic travel, specifically by joining Boom Overture with their existing fleet of Airbus and Boeing planes. Boom Overture aims to revolutionize air travel with quieter cabins and a focus on sustainability, targeting business class passengers. This move could potentially halve flight times, and United has already ordered up to 50 Boom Overture supersonic planes, with the first passenger flights expected around 2029.