Love them or not, regional jets play a critical role in US aviation. Examining every planned service using Cirium Diio data shows the country will have 7,000+ daily RJ flights in February. That is more than one in four of the total (28%), although there is, of course, a higher proportion domestically (30%). Inevitably, American Eagle is by far the largest operator, with Envoy Air and PSA being the two key providers on a capacity purchase agreement basis.