Cancel - but without that annoying "oh, that'll be an extra umpteen quid". Why? Whatever the answer is, it always sounds to me like "because we've got you over a barrel, mate".
Pet hate: announcing a 5 hour delay, in half-hour installments. OK, anyone can get it wrong, and a minor problem does occasionally turn into a major problem. But it always seems to me that the real reason for doing this is to stop people asking for their luggage back off the plane so they can take the train instead. Or another plane.
It might just be my imagination, but if the flight is the only one of the week, the 14-hour delay is announced all in one; but if it's a short-haul, it's announced half-hour by half-hour.
Referring back to a thread in R&N, this inclines one to think - "only half an hour - let's have another beer". Repeat ten times, and you have incipient air-rage. Let the pax take le shuttle, or the competitor, or whatever, and they'll be home quicker, safer, and more sober. And they might fly with you again.
[This message has been edited by justapax (edited 17 May 2000).]