Airtel Annual Plan Queue

No. It will start after the current plan ends. I am sure about 1 recharge of same denomination

Airtel recharges of 455 & 1799 will queue on top of each other if they are of the same denomination meaning if your current plan is 1799 then another 1799 recharge will queue over it. But if your current plan is 455 & you recharge with 1799 before the expiry of the current plan, the 1799 plan will NOT queue and become immediately active along with your current 455 plan.

I have done it yesterday for 4 of my Family, it will extend validity as long as it stays withing 730 days. It worked on all 4 of my numbers.

Current plan --> 1799 - 365 days.

Recharged with --> 1799 - 365 days. All numbers had less than 6 months validity remaining on current plan and new plan extended the validity by 365 days.

In my 2 Airtel mobiles current running plans are 478 and 719 , Can i recharge with yearly 2999 plan ?

Yes stacking of yearly plan 1799 will work, I have done the same now I have 730 days validity.

You can't do more then 730 days.

I have 455 plan running and 2 455 plans are in queue so can I recharge 1799 now?