The Ministry of Interior's air wing had been using the choppers for anti-narcotics operations and combating terrorism.
The Americans have already made "redirection" arrangements - selling it to a third party - so Pakistan cannot re-buy those helicopters. Instead, Pakistan will have to renegotiate a fresh deal, says a Dawn report.
Citing diplomatic sources, the report adds that it should not be difficult to do so as both American and Pakistani officials acknowledge a direct link between narcotics and terrorism financing, Washington believes that stopping drug-trade in this region will also help reduce terrorism.
Pakistan renewed its interest in acquiring the choppers after the recent change of leadership in the interior ministry.
"The decision to return the helicopters was taken by the former interior minister, Chaudhry Nisar Ali Khan, while the new minister, Ahsan Iqbal, concluded that the ministry needs them to monitor the drug route, which is also used by the militants," reports Dawn.