I used to fly on business when I was working and my recollection is that the flights to places I went were pretty much fixed for years and always departed at the same time. Just dropped relatives off for a flight to Gibraltar and BA490 which is a daily flight seems to depart at a different time each day between 06.15 and 09.30 although it appears its the same time on a specific weekday so Fridays its 07.00. Just curious as to why this happens as it must have a knock on effect on staffing in Gibraltar which sees a handful of arrivals each day and also with slots at Heathrow or is it a case that BA has an 07.00 slot and just happens to use it for Gib today.