Manuel, I payed 940.00 euro back in april for flights to New york for myself and my wife with aer lingus , We are flying out in october, They are now coming in at 2061.00 euro for the same flights in their sale, I like others have no idea how airlines operate regarding seat prices, I would suggest if the price is within your budget then take it, If it goes down there is nothing you can do about it but if it goes up you will pay for it, For what it is worth we travelled with aer lingus to Spain twice this year and booked well in advance and saved hundreds, It is not an exact science but I monitored flights two years ago when we were planning on going to the states with friends who had already booked and they rose considerably, We did not go in the end, This is just my personal experience , Best of luck Manuel.