Both Delta and US Airways have a three-tier redemption structure, offering seats at the basic level, a midtier level at around 40, 000 miles for a domestic coach ticket and a full-fare level for as many as 60, 000 miles for domestic coach round trips.

WSJ: Frequent-Flier Miles: Best Airlines for Cashing In

Finally, the industry would be prohibited from barring customers who engage in creative, fare-saving ticket-buying.

FORBES: Fact and Comment

When Air Canada implemented its new pricing structure, it also eliminated many travel restrictions that passengers hated, such as requiring a Saturday-night stay and a round-trip ticket to get the lowest fare.

CNN: Pros and cons of a la carte airfare pricing

That was when the city authorities, in a bid to attract drivers of private cars off the road, slashed the ticket prices on the subway -- by more than half in some cases -- and introduced a flat fare of 2 Yuan (30 U.S. cents) with unlimited transfers.

CNN: Beijing commuters feel the squeeze