Originally Posted by FlyerGoldII
I believe that Singapore Airlines is one such airline.
As others have mentioned, this is not the case. From first hand experience, NRT-LAX-NRT is available in budiness class at heavy discounts on SQ (often around $2000 roundtrip)
http://abroad.air.travel.yahoo.co.jp...ao=o&x=36&y=18 (in Japanese, but the pricing should be viewable from here)