Male Pilot logic... Flawless

This a conversation between a man and his wife. Please note that she asks five or six questions which he answered quite simply,

but then she is speechless after answering only one question. l bet this happens more often than not to most husbands out there:

Woman: Do you drink beer?                             

Man: Yes

Woman: How many beers a day?

Man: Usually about three

Woman: How much do you pay per beer?

Man: $5.00 which includes a tip (this is where it gets scary!)

Woman: And how long have you been drinking?

Man: About 20 years, I suppose

Woman: So a beer costs $5 and you have three beers a day which puts your spending each month at $450. In one year, it would be approximately $5400 correct?

Man: Correct

Woman: If in 1 year you spend $5400, not accounting for inflation, the past 20 years puts your spending at $108,000 correct?

Man: Correct

Woman: Do you know that if you didn’t drink so much beer, that money could have been put in a step-up interest savings account

and after accounting for compound interest for the past 20 years, you could have now bought an airplane?

Man: Do you drink beer?

Woman: No.

Man: Where is your airplane?