I took a flight on Air New Zealand's secret first class that you probably didn't know existed. Here's what it's like.

In 80 hours, the journey circles the globe entirely in first class — from Dubai to London, Chicago, Tokyo, Bangkok, and back again. There are private suites with sliding doors, Beluga caviar at ...

Long-haul flights are on average more efficient than shorter flights. Take-off emissions only occur once, and larger aircraft with more seats are typically used on longer routes. For similar reasons, ...