Though we should all know what stock our tickets are booked on
I have called a few airlines lately to upgrade and have been told its not a go

even when I have booked with that airlines flight no(eg qantas EK)
can anyone chime in on this I specifically need to know
Alitalia
Air france
China Airlines
Eirates
Sri lankan but it would be good to have them all
I did a search but no fruit!