"We're hopeful that somebody will come to a conclusion that changes this, " Cozart said.

CNN: FAA begins process to close 168 towers on April 1

Philips plans to introduce a hand-held drug-testing device in 2009, in partnership with Cozart, a British medical-diagnostics firm.

ECONOMIST: Labs on a chip

Cozart said an FAA contracting official gave him notice that it intends to close 77 of his towers, jeopardizing the jobs of more than 400 of his employees.

CNN: FAA begins process to close 168 towers on April 1