Originally Posted by
ctdubl07
Thank You BM.
I am looking to book via American and use their System Wide Upgrade to book from main cabin to business.
Fom the AA website re Systemwide Upgrades:
On British Airways
Enjoy a confirmed upgrade from most Business fares to First, from Premium Economy to Business, or from Economy to Premium Economy when flying transatlantic on British Airways.
Systemwide upgrades can be used for one-way travel for up to 3 flight segments on British Airways marketed and operated flights or British Airways operated flights marketed by American. At least one American marketed flight must be in the itinerary to be eligible.
https://www.aa.com/i18n/aadvantage-p...e-upgrades.jsp
I believe what you describe as main cabin is world traveller on BA (Economy). If so, according to the AA website any upgrade would be to World Traveller Plus (premium economy).