Add fuel emergencies

docs/flight-planning/fuelplanning.md

@@ -146,4 +146,12 @@ Add your required reserves to determine your calculated minimum fuel, then apply
     **The aircraft can remain in the hold for another 51 minutes before a diversion becomes necessary.**
 
 ### Inflight Fuel Emergencies
-- MINIMUM FUEL and MAYDAY FUEL calls (link to radio page)
+As explained in [Reserve Fuel](#reserve-fuel), you are required to land with your Final Reserve fuel intact (untouched). During the course of normal operations, this should not be a problem. If, through poor planning or unexpected enroute delays, you are expecting to land with less than your Final Reserve fuel onboard, you must notify ATC, as per below.
+
+#### Minimum Fuel
+You must declare `MINIMUM FUEL` to ATC when you are informed of a delay which will result in you using all of the holding fuel you have onboard. This means that the current delay will **not** result in you landing with less than your Final Reserve fuel onboard, but any *additional* delay will.
+
+In response to a declaration of MINIMUM FUEL, you will not receive any priority from ATC, however you will be informed of any expected *additional* delay.
+
+#### Mayday Fuel
+You must declare `MAYDAY FUEL` when you determine that you will be landing with less than your Fixed Reserve onboard. The declaration of MAYDAY FUEL constitutes an emergency and you will receive priority from ATC to enable you to land as soon as possible.