Anthrax georgicus (Diptera: Bombyliidae), presumably. Among Spartina patens and Juncus gerardii, off trail at Salt Marsh Nature Center, Marine Park, Brooklyn, NY.
Observed mating pair land on Xanthium strumarium (rough cocklebur) leaf.
Fuzzy bee fly visiting White-flowering Currant (Ribes indecorum) beside Gale Mtwy in the Claremont Hills Wilderness Park.
The absence of spots on the wings, dark leading edge of the wings, with a hyaline trailing edge, and the flight time all suggest B. major. See the identification information on BugGuide.