The new timeline could slow cleanup in some communities by nearly a decade. The chemicals, widely used in the military, are linked to cancers and other health risks.
Forever chemicals are used in firefighting foam. Above, a training exercise in 2012 at Cannon Air Force Base in New Mexico, one of several sites where groundwater has been contaminated.
The 747 jetliner needs extensive security modifications. Some members of Congress worry that President Trump will pressure the Air Force to do the work too quickly.
The new plane will be the third aircraft being retrofitted for use as Air Force One, replacing two planes that have been in use for 35 years and have had maintenance problems.
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