The RFI message is the default setting of any flightplan with an issued slot. Basically if a better slot becomes availalable for you it will automatcially be given to you without having to file an RFI.
Sometimes i feel i really have to disagree with the above statement!!
We sit and try to improve slots by rerouting to avoid regulations and improve our operators on time performance.
Of course this is standard however there are times when we just fail to find an alternative route.
Now our 'RFI' msg is normally in as soon as a slot is issued just so that we get the point across to the guys at CFMU that we are happy to take any improvement. 9 times out of 10 we call CFMU as soon as we get a call from the Captain and we get an improvement straight away. Why does it take a phone call to get an improvement???
G-MANN