If you see a decent price for a seat on a plane online, don’t wait around to make up your mind!!
Just booked flights to Amsterdam for myself and my brother, his girlfriend and a friend and, by my reckoning, because we waited until after just after midnight to make the booking, having started looking around on AerLingus.com about a half hour previous, the price of the seats went up by EUR30 each outbound and E25 each inbound.
Some pain in the arse!
Almost as bad as the nightclubs are these airlines!