Luton Airport has reopened after a vehicle fire caused a car park to collapse, sparking disruption for tens of thousands of passengers.The Bedfordshire airport suspended flights from when the fire happened at around 9pm on Tuesday until 3pm on Wednesday.PA news agency analysis of flight data websites found at least 150 flights due to take off or land at the airport were cancelled.A further 27 arrivals were diverted to airports as far away as Cardiff, Liverpool and Manchester, while many other flights were delayed.The figures suggest more than 30,000 passengers suffered disruption to their journeys.