Indigo airlines is one of the largest operators of the A320neo, and have now bought 150 A321 neo’s. (They are also eyeing the A330neo, but haven’t ordered them yet.) I have flown with them multiple times, including the A320neo’s and had an overall enjoyable experience with them.
For anyone interested, here’s Josh Cahill’s review on Indigo airlines:
IndiGo is the largest operator of the A320N and one of the, if not, the largest operator of the A321N. It has also placed an order for 300+ A321N. Would definitely love to see this livery in IF. You got my vote!