It comes after militants released a video of about 130 girls, saying they could be swapped for jailed fighters.
Boko Haram seized them from a school in the northern Borno state on 14 April.
"We have shared commercial satellite imagery with the Nigerians and are flying manned ISR (intelligence, surveillance and reconnaissance) assets over Nigeria with the government's permission," said a senior administration official, who declined to be named.
A team of about 30 US experts - members of the FBI and defence and state departments - is in Nigeria to help with the search.
The BBC's Rajini Vaidyanathan in Washington says the types of aircraft deployed have not been revealed, but the US has sophisticated planes that can listen into a wide range of mobile phone and telecommunications traffic.
Looking for clues
Other officials, quoted by Reuters, said the US was also considering deploying unmanned "drone" aircraft to aid the search.
US state department spokeswoman Jen Psaki said earlier on Monday that intelligence experts were closely examining the Boko Haram video for clues that might help locate the girls.
Pogu Bitrus, a leader in the town of Chibok, from where the girls were seized, said vegetation in the video resembled that in the nearby Sambisa forest reserve.
CAN said the 90% of the kidnapped students are Christians.
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