Originally Posted by
christep
True for money, but it is possible to upgrade individual xONEn sectors using miles. I've done this with AsiaMiles in the past using a roundtrip upgrade where the underlying sectors were actually on two separate DONE3 tickets.
Originally Posted by
danger
Absolutely possible.
Originally Posted by
Himeno
Upgrading flights on oneworld tickets are only possible with L fares on flights with premium economy with a per sector surcharge, or within the rules of a frequent flyer program.
ie, as a QFF member, I can use my QF points to upgrade QF coded, QF operated flights on an xONEx.
All very true of course, thank you for noting this.
My post should be considered strictly in the meaning of upgrading a D fare by paying some kind of supplement on individual sectors.