At work I have been using the 24 hour clock not because of the new world wide economy I still have to adjust my time with theirs when I need to contact them but in the air freight business I was in before there is no chance of error. Like " I thought you meant the 7am flight not the 7pm flight." I really do not need it where I am now but I am so used to it that I just have been slowly teaching my crew to use it. I think it should be a requirement if you operate 24/7. That brings up another mater sort of tied into this one and that is change. It really is not that difficult to learn the 24 hour clock but I've got guys that can not figure it out to save their lives. It's that silly little mental block we all put up when we face change. I try and tell them it is easier to figure out there overtime that way