A Homeland Security Department official said Tuesday all of the 150 new machines will be installed by the end of June. The official spoke on condition of anonymity because the announcement is not yet public.
The body-scanners were purchased with money from President Barack Obama's stimulus plan announced in February last year.
The use of the machines in airports is a key part of the Obama administration's plans to improve airport security. Obama called for buying hundreds more of them after the attempted Christmas Day terror bombing of a Detroit-bound airliner.