United Airlines is slowly rolling out its latest weapon in its battle to fight off low-cost carriers and win over business travelers: new 70-seat regional jets.

Unlike most small jets, these aircraft for short-haul flights of up to three hours on United Express have three seating sections -- first class, "economy plus" and coach. In first class, the Embraer 170 twin-engine planes also have extra legroom (38 inches) and meals (a cold sandwich). Coach passengers get a soft drink and a snack.

Dulles International Airport will eventually have the second-largest concentration of the jets after Chicago's O'Hare International Airport, United's hometown airport.

United is phasing in the new jets partly in response to complaints from customers who said the airline's 50-seat regional aircraft were too cramped. The Embraer planes also allow United -- which has been operating under Chapter 11 bankruptcy protection for nearly three years -- to provide service on less popular routes without having to use larger, higher-cost jets. "Our passengers were less tolerant of the smaller planes, which is why we're going for the 70-seaters," said Sean Donohue, vice president of United Express.

United Express co-pilot Kent Brace said he was pleased by the roominess of the planes. At 6 feet, 6 inches, Brace said he didn't have to hunch over in the cabin, as he did in the 50-seat aircraft. He said that on a recent flight to Montreal, he stood straight up and still had about an inch to spare between his head and the cabin's ceiling. "This is a lot better than the other ones," Brace said.

The planes have a two-seat configuration, meaning no middle seat. There are two restrooms, two pilots and two flight attendants on each flight.

The aircraft don't have any in-flight entertainment because "most travelers have their own iPods, personal DVD players and laptops," Donohue said.

United's new regional fleet is aimed at drawing passengers away from Independence Air, its biggest competitor at Dulles. Independence Air used to operate United's regional jets out of Dulles under the name Atlantic Coast Airlines before breaking away to form a low-cost airline. Independence flies coach-only, 50-seat Bombardier regional planes. "We're going to win this battle," Donohue said.

United will operate 28 of the Embraer planes by the end of the year and another 77 by June.

On a recent flight, St. Louis physician Mike Plisco paid $25 to upgrade to economy plus for the 34 inches of legroom, three more inches than coach. "This is great. But there could be a little more luggage room," he said.

Overhead bin space is somewhat limited, although United Express flight attendant Robin Clark said the bins can hold roller bags as long as 25 inches.

Donohue said travelers can learn what type of plane they're flying either by visiting the airline's Web site or asking their travel agent or the airline's reservation agent when they book their flight.

Amtrak's Last-Minute Fares: Amtrak is taking a cue in revenue management from the airlines and is now charging passengers extra for last-minute seats.

Early last month, Amtrak began charging its Northeast Corridor passengers 15 percent to 25 percent more for tickets purchased close to departure than for the same tickets bought weeks in advance.

The new structure is based on the level of sales prior to departure. The more popular the route, such as the Northeast Corridor Metroliner or Acela on a Friday afternoon, the higher the last-minute rate.

"If a train is almost sold out, you may pay a higher fare if you book at the last minute," said Amtrak spokeswoman Tracy Connell.

Airlines Increase Ticketing Fees: Northwest Airlines last week doubled the fees it charges travelers who purchase tickets with the help of a live person. The move is part of an industry-wide effort to direct travelers to airline Web sites, which process tickets more cheaply.

Northwest -- which is currently operating under Chapter 11 bankruptcy protection -- increased its fees to $10 from $5 for tickets purchased through its reservation lines. Fees on tickets purchased at airport ticket counters increased to $20 from $10. The airline also increased its fees for frequent fliers who obtain their award tickets through an airport ticket agent. Those travelers will have to pay $30 instead of $15.

American Airlines last month raised its fees on tickets purchased through its reservation center to $10 from $8. The increase was intended to put American in line with other airlines, said spokesman Tim Smith. American also charges $15 for tickets purchased at the airport and $15 for frequent-flier award tickets purchased through its call center.

US Airways charges a $5 fee for tickets sold through its reservation agents, $10 for tickets sold at the airport and $5 for award tickets issued through a reservation agent. Delta Air Lines' fee is $10 for tickets purchased over the phone, $15 at the airport and $10 for award travel through an agent.

Manufactured in Brazil, the Embraer 170 has a 70-seat configuration that will let United Airlines offer three classes of service on its regional routes.