Nothing to say it should not continue for some time still. They are in a good position for capturing corporate and leasure travelers. Everyone is looking at spending cuts but corporates still have to travel and if they can do it cheeper with same time/convinience all the better. The worst time is 2 hours to CT and doing so with a drink and food "built into the price" is no longer a requirement. Leasure travelers also want cheepest travel to have more spending money while on holiday.
Same principle applies to your quality low end retailers, Shoprite, Checkers, Mr Price etc.
If you dont need the cash put a trialing stop-loss in place and forget about it. Ride the profit train to the top and when she stalls your trailing stop-loss will kick you out in profit anyway.