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All airlines as far as I'm aware do charge around $125 per flight. Distance doesn't matter.

I think it is reasonable to charge more for larger animals. If your dog takes up a seat then a ticket price is a fair price.

If you have a well behaved animal it is basically just a carry-on.

If some flights aren't profitable that doesn't justify price gouging people with animals that weigh nothing and use up no jet fuel. Increase ticket prices and baggage prices. That actually makes sense.