US Central Command said C-130 transport aircraft had made “multiple” drops of supplies provided by Kurdish authorities in Iraq.
US air strikes have helped push back IS in the town near the Turkish border.
Correspondents say the airdrops are likely to anger key US ally Turkey.
The drops of supplies provided by Kurdish authorities in Iraq were “intended to enable continued resistance against Isil’s attempts to overtake Kobane,” CentCom said in a statement. IS is also referred to as Isil and Isis.
All the aircraft involved had returned safely, it added.
CentCom says US forces have conducted more than 135 air strikes against IS in Kobane. The strikes began in early October.
“Combined with continued resistance to Isil on the ground, indications are that these strikes have slowed Isil advances into the city, killed hundreds of their fighters and destroyed or damaged scores of pieces of Isil combat equipment and fighting positions,” the Centcom statement said.
However, it added that IS fighters continued to threaten Kurdish forces’ ability to resist and hold the city. “Kobane could still fall,” it said.
Senior Washington officials said the airdrops had involved three planes and 27 bundles of supplies.
On Sunday, Turkish President Recep Tayyip Erdogan said he would not allow Kurdish fighters to receive any transfers of American arms.
Turkey has resisted calls to help the Kurds fighting in Kobane, describing them as terrorists like the Kurdish militant group the PKK.
Turkey has faced a decades-long insurgency by the PKK, which is also regarded as a terrorist group by the US and the European Union.
A US administration official said President Barack Obama had called Mr Erdogan on Saturday to inform him that the airdrops would be taking place. The official did not say how Mr Erdogan reacted.
The US air drops represent a significant shift in Washington’s policy towards the Syrian Kurds.
Syrian Kurdish fighters confounded the bleak predictions about Kobane’s imminent fall, and the air drops are now taking place despite objections from the Turkish government: Turkish President Recep Tayyip Erdogan had said his country would not agree to any US arms transfers to Syrian Kurdish fighters.
Nevertheless, the US state department recently declared that it had held the first direct talks with the Syrian Kurdish Party – considered an ally of the Kurdistan Workers’ Party (PKK), which fought a three-decade war against the Turkish army until 2013.
US officials have previously said that they had to limit their relations with the Kurds in Syria due to objections from Turkey. (BBC)
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