Right with you Hand...
The idea of giving carriers 4/365ths of their revenue is to compensate them for the loss of revenue on the days following September 11th when US airspace was closed. Taken to its logical conclusion, I suppose, this would suggest that in the UK only BA and Virgin should be compensated and only for an amount commensurate with lost revenue from their transatlantic operation on those days.
The amount of cash that this represents is but a drop in the ocean that the two carriers mentioned above have lost and will be losing in the months to come due to reduced loads and increased security costs. The EU is rightly taking a firm line with the bailing out of innefficient airlines be they flag carriers or otherwise, but even they cannot begrudge carriers some compensation for losses directly caused by the tragedy in the US.
Don't worry angrycat. Any carrier that is so close to the wall that a few days lost revenue from a percentage of their routes will send them over the edge will not survive long in the current climes, even if they receive some limited state aid. This EU proposal is not about pouring unlimited cash into innefficient airlines, but softening the blow slightly for companies that provide thousands of job and an essential service that could otherwise be provided by foreign (non-EU) carriers.