New York City Mayor Eric Adams (D) has been fending off mounting allegations of corruption in regard to his dealings with Turkey since November. Now, the Federal Bureau of Investigation is probing the mayor’s campaign regarding alleged free flight upgrades from the airline partially owned by the Turkish government. The New York Times reported Friday that the FBI is reportedly looking into Adams’ flight upgrades as part of its broader investigation into whether the Turkish government funneled foreign money into the mayor’s campaign war chest. The bureau is also looking into any possible foreign…