Thanks for updating this. I've been using the old version a lot lately and it's good to have it updated.
a)Jet Airways. Miles expire after at the end of each quarter, 3 years after they were earned, regardless of activity.
b)In general: "No expiration as long as ....
Should you just say what you need to do to keep the miles alive? Because otherwise they will expire.
Instead of: "No expiration as long as you redeem or earn at least 1 mile every 18 months."
Maybe: "You must redeem or earn at least 1 mile every 18 months."