Airtel has been one of the resilient stocks over the last few months even as the AGR issue and Coronavirus-fueled market crash has wiped off lakhs of crores of investor wealth.The Airtel stock could rally thanks to the Jio-Facebook deal and the weakening of Vodafone Idea.The Airtel stock has been given a ‘Buy’ rating with a target price of ₹606, which is an upside of more than 20%.Airtel was the market leader before the arrival of Reliance Jio, but it has since ceded its lead position to the Mukesh Ambani-owned telecom company. However, the gap between the two leading mobile service providers may be too huge, according to market experts.When it comes to the market cap, though, Airtel is 1.6 times smaller than Jio. Vodafone Idea, on the other hand, is 39 times smaller than Jio, which is currently