ATCOs/HD - if you look at the links in my edited post of 12/5, it would appear wise to 'expec't at least one MAYDAY if a g/a occurs?
Does this help with your planning?
In the case of the BA 747 into MAN, we COULD have had the situation where a company minded Nigel was on final to land with 30 mins fuel remaining (ie no diversion fuel) and ordered to g/a for the MAYDAY jumbo behind...................... oh what fun we had.....
Let me see. Off to LPL with Nigel (1) on a MAYDAY with 'not much' left, next a/c after the jumbo broken off the approach (now on a MAYDAY) in case 747 blocks the runway, next one into the hold, now short of fuel, on a PAN. Anyone want to continue the story?