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... But the flights in West Africa follow U.S. President Donald Trump's threats in November to militarily intervene in Nigeria over what he says is its failure to stop violence targeting Christian communities. The flights also are occurring just months after a U.S. pilot working for a missionary agency was kidnapped in neighboring Niger. ...

Flight tracking data shows the operator is Mississippi-based Tenax Aerospace, which provides special mission aircraft and works closely with the U.S. military, according to the company's website. Tenax Aerospace did not respond to a request for comment.

Liam Karr, the Africa Team Lead for the Critical Threats Project at the American Enterprise Institute, has analyzed the flight data. He said the operation appeared to be running out of an airport in Accra, a known hub for the U.S. military's logistics network in Africa.

Karr said the operation was an early sign the U.S. was rebuilding its capacity in the region after Niger ordered U.S. troops to leave a sprawling, newly built air base in the desert last year, and turned instead to Russia for security assistance. ...