American Airlines clients wanted negotiated discounts to apply to more of their purchases. The airline is now rolling out a new corporate pricing structure for international routes that does just that. To make it so, AA is basing discounts on fare basis codes rather than booking classes. It's not a new concept in the industry. AA already does it in the domestic market. Travel management consultants said they've seen more of it lately, from other carriers, too. They see the benefits for buyers but also complications.

Typically, several booking classes comprise a cabin of service — economy, business or . . .

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