Can you not check-in online up to 14 days prior to the date of your flight? Surely most people won't leave check in till the last minute? I know I always try and do it in plenty of time just in case there is a glitch in the system or my own PC? I'm sure there will be some who don't know and will get hit with a fee to check-in at the airport. It is to be hoped however that as well as the notice on the website the airline has sent an e-mail notification to anyone intending to travel on the 24th advising them of the system down time.