Which pricing innovation was FIRST widely adopted by the airline industry before spreading to other transportation sectors?

Dynamic pricing has revolutionized how transportation companies maximize revenue while balancing supply and demand. From airlines to rideshares, sophisticated algorithms now adjust prices in real-time based on numerous factors. How well do you understand these cutting-edge pricing mechanisms that power modern transportation businesses? Test your knowledge of transportation industry pricing innovations with this challenging question!

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Yield management (selling the same seat at different prices based on demand forecasting)
Surge pricing (temporarily increasing prices during periods of high demand)
Subscription-based pricing (charging a recurring fee for unlimited access)
Route-based dynamic pricing (charging different rates based on popularity of destinations)