White Top by M L Buchman

When a political conspiracy targets the White House's aircraft-only the nation's #1 air-crash investigators can save the country.
The White Top helicopters of HMX-1 are known by a much more familiar name: Marine One. The S-92A, the newest helicopter in the HMX fleet, enters service after years of testing.
When their perfect safety record lies shattered across a Maryland shopping mall, Miranda Chase and her team of NTSB crash investigators go in. They must discover if it was an accident, a declaration of war, or something even worse.

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