hi all, just a point on feasability. i fly the 737ng frequently and i have this question. if you loaded a flight plan into the FMC using airac 0808 and saved it, would this flight plan be valid if you flew it at some point when airac 0809 was current, or would there be discrepancies in the 0808 against the 0809. its something i have not tried but wondered if it would work properly. thanks in advance for any replies. richard welsh.

That would depend entirely on whether the route in question is affected by any changes with the new AIRAC. If, for example, a waypoint on the route existed on 0808 but not in 0809 then you would get an error in the route. Sometimes a whole airway can be removed in a new AIRAC and then your route would not work. Having said that some of my saved 737 routes were saved years ago and are still valid with the latest AIRACs and work absolutely fine. So, the answer is it depends on the route.