Have you ever paid tip to crew in flight? Now you'll have to

You must have paid a tip to a waiter or a bartender. But have you ever paid a tip to a cabin crew? US-based Frontier Airlines has now allowed its cabin crew to ask for a tip from its passengers after they bring refreshments around the plane. From January 1, 2019, this action has come into effect. One of the passengers wrote about this in his blog and said that he never experienced anything like this ever.