Originally Posted by
ABJ92
Totally depends on aircraft ceilings and wind conditions.
Generally A320 series and 773s will never be above FL390
Originally Posted by
ahmetdouas
the airbus A320, B738 regionals do 34-38 usually and very rarely 41, the A321 is a pig fully loaded, 34000 was optimum according to the flight computer when I was in the cockpit of a heavy A321
You don't ever want to see an Airbus narrowbody going above 39,000ft regardless of circumstances, as that is it's service ceiling! The 737NG is capable of higher and it isn't unusual to see Ryanair/Jet2/TUI cruising at 40/41,000ft on longer bucket and spade routes.