Original sentence: British Airways has been plagued by difficulties in recent years.In 2007 Heathrow was voted the world's least favourite alongside Chicago O'Hare in a TripAdvisor survey.. The recent move to Heathrow Terminal 5 has been a disaster, heavily critcised by politicians, unions, airlines and passengers.Many of BA's problems stem from being based at London Heathrow airport which has become crowded and subject to delays.The Association of European Airlines reports that BA are the worst airline for lost and delayed baggage, losing over twice as many bags as the average.They are also the worst airline for punctuality of short/medium haul flight departures and arrivals and ranked 17th out of 21 airlines for long haul delays