I disagree to a point. I used to fly transaltantic a mix of Virgin and Continental crediting all the miles to CO. I had a poor experience at EWR at the so called service desk that if I hadn't known better would have left me with a 24 hour delay instead of a 12 hour overnight delay (total denial on CO's part of code-share)-I resolved it by calling customer service but I shouldn't have HAD to- That alone didn't stop me flying CO but when followed by a very poor Virgin flight that included safety issues led me to switching all my transatlantic travel to AA- a decision I'm happy with and am unlikely to use CO/VS again as the miles with AA are mounting up and I don't fly enough to justify diluting them (am currently gold-with a reasonable chance of making Plat this year). I wouldn't say I'd never fly either carrier again but there is little incentive to pull me away from AA at this point with the routes I currently fly and the incentives I get from Aadvantage (served also by CO and VS-but I'm happy with AA and if it ain't broke-why try and fix it)