By Simon LewisWASHINGTON, March 5 (Reuters) - The U.S. State Department said on Thursday it was ramping up the provision of charter flights from the Middle East after criticism over the Trump administration's planning and initial assistance to U.S. citizens trying to leave the regionsince the U.S.-Israeli war on Iran began.The strikes that began on Saturday and Iran's retaliatory attackson its neighbors have led to widespreadairspace closures, clogging busy aviation routes throughout the region...