If you are heading to the US, make sure you travel on American Airlines where B787/B777 operates the flight. There are Sports24 and Sports24 Extra live TV on the entertainment system on board AA Boeing aircrafts, which every World Cup game is live while flying even above 30,000 feet. Occasionally I could watch it while on ground.
And if you are traveling on BA, finger crossed that the flight deck may inform you the result through PA.