How to say “They keep saying supersonic passenger flights are coming back, but I'll believe it when I see the ticket prices.” in Japanese

In Japanese

超音速(ちょうおんそく)の旅客機(りょかくき)が復活(ふっかつ)するってずっと言(い)われてるけど、チケットの値段(ねだん)を見(み)るまでは信(しん)じないよ。

Chōonsoku no ryokakuki ga fukkatsu suru tte zutto iwareteru kedo, chiketto no nedan o miru made wa shinjinai yo.