The two carriers now dominate air service between those cities, and critics say that they will have little incentive to compete once they are allied.

And the orange and red Boeing 737's of Southwest Airlines have spread to almost every part of the country, bringing price competition to many routes that full-fare carriers once dominated.

The sign of the thermopower can determine which charged carriers dominate the electric transport in both metals and semiconductors.

In almost all hubs, one carrier now dominates.

Effects on Prices At those airports, the agency's survey found, average fares are 27 percent higher than fares at 38 airports where no one or two carriers dominate.

In general, it found, fares are highest at airports where the leading carrier has the largest share of the market, and lowest where no single carrier dominates the market.

Only eight carriers dominate the industry nationwide.

Eight carriers now dominate the market, handling 94 percent of all domestic air travel.

These carriers with nationwide route systems dominate most of the major hubs.

Combined with a Direct Connect ability such as that offered by Nextel, the carrier would surely dominate its market.