<span style="color: #222222;">Directorate General of Civil Aviation today directed airlines to stop taking bookings. In its circular for all airlines, the aviation regulator said, no decision to commence operation of domestic and international flights with effect from 4th May has been taken yet and it asked them to refrain from booking tickets. </span><br />'' <br />'' <span style="color: #222222;">It also said the airlines will be given sufficient notice and time for restarting of operations.</span><br />''