You have no reliable way to project the cost of supersonic flight 50 years in the future. It will come down. That's all I'm certain of.
I'm sure people told the Wright brothers similar things. You're simply being extremely short-sighted. Which is very ironic since you're also talking about climate change concerns around this post.
I'm sure people told the Wright brothers similar things. You're simply being extremely short-sighted. Which is very ironic since you're also talking about climate change concerns around this post.