I'm sure it was said at one point that 1 million passengers a year was the point at which the development fer could be reassessed. However I suspect that if and when that number is reached, it won't be. A funding stream like that is something of a drug, once you have it it's very hard to let it go. Based on current passenger numbers, and allowing for under 12s not paying it, it must be generating close to €4m a year for the airport. I think any suggestion of ever increasing it due to inflation etc would be very poorly received however.