Originally Posted by
mmamminna
Would that be free or I have to pay and how do I do it? TIA
Paid, prices differ (see
this thread), but in the most reasonable of all worlds, you may be asked to fork out about 400 EUR per person per long-haul segment.
At OLCI, you may be either directly offered an upgrade; or a seat map may show a Business class seat available, with a price tag attached.
If this is not on offer, you may simply ask at the check-in counter whether buy-ups are available.