A rule of thumb: plenty of nationwide carriers like Mindspring and Earthlink offer good value for less than $20 a month.

"This could break in subtle and unexpected ways when large, nationwide carriers begin natting large swaths of customers."

Roadway, a nationwide long-haul carrier, has been given an option to buy 800,000 new shares, or 20 percent, of Viking, for $35.50 a share.

They used an undisclosed nationwide cellular carrier.

Although it's a nationwide carrier, Alltel's biggest customer base is in the south.

It is widely believed that when the dust settles, only Delta, American, and perhaps United will remain among the large nationwide carriers.

Continental has emerged as a nationwide carrier with a major presence in the East.

Instead of six nationwide carriers, they say, a more economically feasible number might be three or four.

PSA had planned from the start to become a nationwide carrier, but this never came to fruition.

The airline built its route network around its hub in Phoenix, eventually growing into a nationwide carrier with service to 54 cities.