Doctors, nurses and medical staff wave during a fly-past by an Air Force helicopter over the Indira Gandhi Institute of Medical Science (IGIMS) as the Armed Forces express gratitude towards frontline Covid-19 workers, on May 3, 2020 in Patna, India. A fleet of military jets undertook a spectacular fly-past over New Delhi as part of a nationwide exercise to express gratitude to doctors, paramedics, sanitation staff and other frontline workers engaged in the fight against Covid-19.