Originally Posted by
balicab
Could be a response to some operators policy of filing plans with non-realistic levels (let's say ryanair to london filed with fl240), and as soon as they exit approach, they request Fl360/380 and a direct??? That pretty much messes the entire nmoc / predictible flow idea.
Where do you get the idea that Ryanair files non-realistic levels? In your specific example I have been filed FL240 to London, but that was due to operating with a single air conditioning pack, which makes us restricted to maximum FL250. If not we are always filed close to the optimum level (usually FL360-380), or slightly lower if the upper sectors are saturated.