The aviation authority is likely to introduce the long-delayed air train at the Delhi airport. It is learnt that Indira Gandhi International Airport officials are considering two options for a transit system to ease commuting between terminals. The options are – six km route with four stops or eight km route with six stops. This change is intended to provide a seamless connection between Terminals 3 and 2 on one side and Terminal 1 on the other, thereby minimizing the current road congestion.