In recent past number of travel agencies have suddenly gone bankrupt or closed shops leaving large number of customers without tickets which they had apparently purchased several months in advance. These customers were shocked, when they went to airport to catch their flights, and were told that there exist no tickets in their names. The piece of paper which they thought was E-ticket was in fact an itinerary (booking). An itinerary not backed up by a ticket is a useless piece of paper. A booking or an itinerary is automatically cancelled by airlines if tickets are not purchased/issued within few days or some times within few hours of booking. If your travel agent or an online travel website has purchased a ticket from Airline against that itinerary, only then that itinerary has a value otherwise it’s a piece of paper with no value. One way of making sure that you have purchased an actual E-Ticket is

You can visit Taj Mahal in Agra from Delhi in one day and return back to Delhi easily. You can go from delhi  by Air, By Road by taxi & bus and also by Train. There is an Airport in Agra and from Delhi to Agra, it will cost you a minimum of around NZ $235-$350 per ticket when you buy in India and the journey normally  has 2 stops at Gaya & Varanasi, with stopovers it may take around 24 hours to reach Agra.