Jeez what a bunch of cynics we are becoming. Airlines are damned if they don't give passengers information about delays, and not believed when they do!
From my experience in the truthfulness stakes the passengers are more likely to be spinning a yarn than the airlines. The fanciful stories invented to try to avoid paying excess baggage charges; to get onto a flight that they have arrived late to the airport for; and most amusingly when asked to give details of the contents of a misplaced/misrouted piece of their baggage, are far more frequent than any untruths from an airline about a delay.
I well remember a chap who claimed he only had designer labelled clothes in his luggage, plus an expensive camera, expensive after shave etc. The bag was found and forwarded to the airport the next day and as he was living close by he agreed to come and collect it. As his claim was so high for the contents, and for reasons I won't go into now the airline could have been liable on this occasion, it was agreed we should ask him to open the bag in front of a policeman to ensure nothing was missing from the bag. Oh quelle surprise, all the clothes were from cheapo clothing stores and not a single designer label to be found. The policeman warned him that the airline had every right to pursue him for making a fraudulent claim. We didn't pursue it, but I doubt he will have pulled the stunt again.