Rail and air travel are unlikely to resume after May 3 as social distancing remains a concern in the fight against the highly infectious novel coronavirus or COVID-19, which has infected more than 15,000 people in India, killed more than 500, sources have told NDTV. Prime Minister Narendra Modi had earlier this week extended the nationwide lockdown, which began on March 25 to check the spread of COVID-19, to May 3.