ETHIOPIA has allowed humanitarian flights to its northern Tigray region, amid concerns that aid is not reaching people facing famine, but the civil aviation head said no such flights had yet left the capital. Ethiopia's government has been battling the Tigray People's Liberation Front since November and thousands of civilians and an unknown number of combatants have since been killed. Last week, government forces said they had withdrawn from the Tigray capital of Mekelle, but the TPLF said its forces seized the city, a major shift in the conflict. Prime Minister Abiy Ahmed's government declared a unilateral humanitarian ceasefire and…