An aircraft takes off from USS Eisenhower

WASHINGTON (CNN) -- NATO members have pledged a total of 430 planes to comprise the strike force against Serbia, should NATO's political arm give the go-ahead for airstrikes against Serbian targets, Pentagon officials told CNN on Thursday.

The NATO alliance is expected to meet Saturday, and an activation order to use force against Yugoslav President Slobodan Milosevic for his failing to fully withdraw troops from Kosovo province will probably be taken up then or on Monday, a NATO official said.

Pentagon sources tell CNN the United States will supply roughly 60 percent of the strike force, or 260 planes, including two B-2 stealth bombers, 12 F-117 stealth fighters and six B-52 bombers equipped with air-launched cruise missiles.

In addition, Denmark's parliament on Thursday voted to contribute four Danish air force F-16 fighters and two reserve aircraft to the strike force.

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The Danish force totals 115 people including pilots and support crews, Danish military officials said. The personnel are on standby for takeoff and would initially be deployed at a base in Grazzanise in Italy, the Danish military said.

Should the U.S. B-2 be ordered into combat, it would be the first such use of the bat-winged bomber, which is able to dodge enemy radar. The B-2 costs roughly $2 billion, and is the priciest warplane ever built for the United States.

The choice to use America's stealthiest planes reflects the respect military officials have for the Yugoslavian military's integrated air defenses, a system of tracking radar as well as fixed and mobile missiles.

In 1995, during the Bosnian War, the Bosnian Serbs used same system to shoot down U.S. Air Force Captain Scott O'Grady's F-16 with a Soviet-made SA-6 mobile missile. O'Grady survived behind enemy lines for days before being rescued by allied forces.

Military sources say U.S. intelligence photos indicate Milosevic is moving around his SA-6 missiles to prepare them for possible use. He also appears to be moving some of his best planes, MiG-29s, into hardened bunkers to protect them against a possible air attack.

Airstrikes against Serbian targets could be launched from U.S. and NATO airbases in Italy, although Italy has said it does not back the use of force against Serbian targets. Italy wants to see more diplomatic avenues pursued first.

Should Italy not give permission for NATO planes to take off from bases within its borders, the U.S. and NATO allies could launch strikes from the sea.

The U.S. 6th Fleet is currently poised in the Mediterranean.

CNN Military Correspondent Jamie McIntyre, The Associated Press and Reuters contributed to this report.