No they are not. At the time of writing (08:40Z), have a look at HB-JZX. Flying from Catania to Basle as U2 1230.
And there are 10 HB-JY* in the air at the moment and all are U2 flights.
Last edited by KelvinD; 9th Jul 2017 at 08:42.
Reason: Additional info