This channel is available in 16:9 aspect ratio but airtel converting it into 4:3 letter box format which is not a good step bcoz these days most people have LED / LCD TV sets and 16 : 9 picture format is best suited for good viewing experience.
They are doing same for CBeebies and i have already written to the broadcaster requesting them to get intouch with airtel and ask them to beam the channel in 16:9 aspect ratio