CORRECTED-Boeing disappointed after China's top three airlines buy 300 Airbus planes

(Corrects to show Airbus is a European manufacturer, not French)

July 1 (Reuters) - Boeing Co said on Friday "it is disappointing that geopolitical differences continue to constrain U.S. aircraft exports" while responding to China's three biggest state-owned airlines buying 300 jets from European planemaker Airbus SE.

The U.S. planemaker added that it continued to urge a productive dialogue between the U.S. and China governments. (Reporting by Nathan Gomes in Bengaluru; Editing by Shinjini Ganguli)