I've flown on the world's only 2 all-business-class airlines. It's like flying on a private jet but less expensive.

• French airline La Compagnie and Maldives-based Beond fly Airbus planes with only business class.
• The model is historically unsuccessful but the airlines are banking on high-demand niche markets.
• I think both are splurge-worthy for people who want a bougie-but-affordable travel experience.

All-business-class carriers are among the rarest airline strategies in operation — and that's because they historically don't work.