CO's 2-cabin longhaul model has proven successful, and has even been copied (whole or in part) by many US and international carriers (e.g., AC, NW, DL, SQ, AA, and CX). In times of industry depression (such as the present), the 2-cabin model has shown itself to be more resilient and adaptive to changing market conditions than the 3-cabin model; indeed, several airlines have at least partially transitioned to a 2-cabin model (SQ, CX, and QF) because reliance on the F cabin as a primary revenue generator had proven unsuccessful.

Therefore, I cannot see CO transitioning back to a 3-cabin model for the foreseeable future.

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Has YOUR airline won an award lately?