Tell me your success stories in regards to giving your cats Acepromazine!

Flying home for the holidays with my 4 year old male kitty. It will be his first ever flight and while he’s not an overly anxious cat, he doesn’t especially like to be in his carrier. I’m concerned that he will be meowing his displeasure throughout the trip. I talked to his vet today who said they would not be at all concerned about giving him a small dose of ace before the flight (we already had some prescribed by our old vet for a cross country road trip but we never ended up using it). Has anyone had success doing this? Reading about Ace on the internet is not very reassuring…..