Both of your replies were helpful Nisgeis. The overlapping of airgroup dates is a new one to me. I have been terminating one, then starting the next. If overlap is possible, well, that solves some other 'teething' trouble I was having. If it works, then some of the things currently in progress just got a LOT easier.
With the information you have supplied, I can now go and 'proof' in testing. Thanks mate, you were a big help
