ETHIOPIAN Airlines is set to take a lead role in ferrying COVID-19 vaccines around the world and expects demand for the service to last for up to three years, its head of cargo services said yesterday. Africa's biggest carrier has turned to cargo services to shore up revenue after the onset of the coronavirus crisis last year sent passenger numbers down sharply. "We have aircrafts converted from passengers by removing their seats, 16 of them, which are very wide aircrafts converted to transport vaccines," Fitsum Abadi, the managing director of Ethiopian Cargo, told Reuters. He was speaking after an Ethiopian…