"This is a silly story and I think it's been unfair to the speaker," White House spokesman Tony Snow said.
Republicans are taking issue with the size of the plane Pelosi would need to fly in to reach her hometown of San Francisco without refueling. There are three Air Force airplanes that have the fuel capacity to make the trip nonstop, with the largest being a C-32 plane, a military version of the Boeing 757-200.
Pelosi's predecessor, Dennis Hastert, used a small Air Force jet that reportedly costs the government $5,500 an hour to operate and carries about a dozen passengers, reports CBS News correspondent Sharyl Attkisson. A plane that would allow Pelosi to fly nonstop apparently costs $22,000 an hour to operate and is outfitted for about 50 passengers. In civilian use, it can carry well over 200.
In an interview with Fox News on Wednesday night, Pelosi speculated that Department of Defense officials were distorting the story as retribution for her stance against the war and former Defense Secretary Donald H. Rumsfeld.
"There are probably those in the Department of Defense who are not happy with my criticism of Secretary Rumsfeld, the war in Iraq, other waste, fraud and abuse in the Defense Department, and I guess this is their way of making their voices heard," she said.
The Pentagon this week informed Pelosi's staff that she would be provided with a plane but that its size would be based on availability and that it could not guarantee nonstop service.
After the Sept. 11, 2001, terrorist attacks, the Pentagon agreed to provide the House speaker, who is second in the line of presidential succession, with a military plane for added security during trips back home.
Pelosi said she would be happy to fly on commercial airliners but said the House sergeant-at-arms office urged her to continue Hastert's practice of using Air Force transport. She said she was informed on her first trip home that her plane would not make it across the country.
"I said well, that's fine, I'm going commercial," she told Fox News Channel's Greta Van Susteren. "I'm not asking to go on that plane. If you need to take me there for security purposes, you're going to have to get a plane that goes across the country, because I'm going home to my family."
Rep. Adam Putnam of Florida, the No. 3 Republican leader, called Pelosi's desire for a large transport plane "an extravagance of power that the taxpayers won't swallow."
"It's important we see what the specific request was," Putnam said.
But Snow on Thursday said the negotiations over Pelosi's transport have been conducted solely by the House sergeant-at-arms and the Pentagon, with no direct involvement by the speaker or her office — or the White House.
The guidelines provided by the Pentagon say Pelosi could be accompanied by family members, provided they pay the government coach fare. The plane could not be used for travel to political events. Members of Congress could accompany her on the plane if the travel is cleared by the House ethics committee.