At least 42 United States military aircraft, including fighter jets and drones, have been lost or damaged during the war in Iran, according to an official report. The losses may increase due to multiple factors, including classification, ongoing combat activity, and attribution, said the report by the Congressional Research Service (CRS).

Recently, the Pentagon declared that the cost of military operations against Iran under Operation Epic Fury has already climbed to nearly $29 billion.

https://www.ndtv.com/world-news/f-15s-f-35-mq-9-reaper-drones-us-report-says-42-aircraft-lost-in-iran-war-11522243