More than 750 Qantas employees have been ordered to self-isolate due to a large coronavirus cluster at Australia’s Adelaide airport, highlighting the vulnerability of aviation workers and passengers to infection. Monday’s disclosure came as trade unions representing aviation workers worldwide have been demanding airlines introduce better safety procedures and cleaning procedures to protect their employees. Airlines are also weighing how to improve safety when travel restrictions are lifted. Qantas said the Adelaide airport incident was the largest ground aviation cluster in the world, prompting authorities to order the Qantas employees to self-isolate for 14 days. The Transport Workers’ Union is considering legal action against Qantas for allegedly downplaying the threat of coronavirus. <br/>