Well you'll never know btc's value at that time. It could plunge to close to 6k or it could rally back to 8k. If you're even considering buying your tickets with btc, that means you're not looking at the long term aspect of bitcoin. And for me, it's meant for long holding. If you've just purchased your btc now, then get out while it's still early if you're not prepared to go long with it.