Airtel allows it, users, to share data plan with anyone on the Airtel network, there are ways to share data on Airtel Network.
How To Share Data On Airtel
You can share data on Airtel to friends or family using the Airtel Me2U feature, using the Me2U feature allow you to share data from your data allowance of data you purchased from the Airtel data plan.
To transfer data dial *141# and press 6 to use the data gifting/sharing feature.
You can gift data to friends or family by buying data for them and pay with your own Airtel balance. In other words, buying data for the person.
To gift data is the same as the procedure above just dial *141# and press 6 then follow the on-screen instructions.