When is it not possible to perform Vistara web check in?

Vistara, the only Indian carrier to add a premium economy cabin class, is a joint venture between the Tata group of India and Singapore Airlines of Singapore. It provides three cabin classes of service- economy, premium economy and business class. Passengers can fly to a limited number of domestic destinations in India using its flight service. They are allowed different baggage allowances as per the cabin class.
Vistara provides multiple ways of checking in. Passengers can proceed to airport counters for this purpose. They can even use the auto-check in facility of the airline if ticket has been booked with some agent. It is also possible to get a Return check-in done if the return flight is within 48 hours. However, it is the Vistara web check in which is extremely convenient for passengers since they can get the boarding pass in email and in their mobiles.
However, Vistara web check in might not be applicable in certain cases. In these situation and these special passengers are required to use the regular airport check-in.

Indian Government Mulling Dropping 5/20 Rule for New Airlines to Fly International

The Government of India, which brought out a rule that every new domestic airline will not be allowed to fly international till the time it has got 5 years of operational experience and a fleet of 20 aircraft, is now considering removing this restrictive rule and letting the players go international. With airline profits bleeding for many years now and new players being reluctant to enter this industry, which many call as a death knell for airlines, this positive move would open the way for exploring more profitable routes and market driven expansion.

The move has been pushed by the new entrant Tatas into the aviation sector.With partnerships in full service carrier Air Vistara (in which Tatas hold a 51% stake and Singapore Airlines the rest of it) and budget airline AirAsia India, the rule has been much of an unwarranted restriction.

However, the current airlines that have been the victims of this ruling for all these years now, are opposing the move saying that the rule shall be applicable for new entrants as well.