Since the "new" merged United Express contains other than the ERJ, possibly he flew the CRJ-700. I know Wikipedia is just an approximate source, but it says:

"The aircraft is equipped with two General Electric CF34-8C1 engines. Maximum speed is Mach 0.85 (556 mi/hr, 895 km/hr) at a maximum altitude of 41,000 feet (12,500 m). Depending upon payload, the CRJ700 can travel up to 2,250 miles (3,620 km) with current engines, and a new variant with CF34-8C5 engines will be able to travel up to 2,895 miles (4,660 km)."

Maybe the next version can do EWR to LHR? That would make transcon passible. Or bring back ocean voyages...