Answer:
valuable, rare
Explanation:
In the airline industry, frequent flyer programs, ticket kiosks, and e-ticketing are all examples of capabilities that are valuable but no longer rare.
A frequent-flyer program (FFP) is offered by an airline to encourage airline customers to accumulate points which may then be redeemed for air travel or other rewards.
An e-ticket known as an electronic ticket enables passengers to buy tickets at their comfort.
