What does it mean for Frontier Airlines flights to be "operated by" another carrier?

When we say that Frontier Airlines flights are "operated by" another carrier, it means that the actual flight is being carried out by a different airline, but it is marketed under Frontier Airlines' flight number. This is a common practice in the airline industry called "codesharing." In this arrangement, passengers may book a Frontier flight, but they will be traveling on an aircraft that belongs to another airline, which might be due to various reasons, such as operational efficiencies or route partnerships.

This allows Frontier to offer more destinations and flight options to their customers without having to operate every single route themselves. The experience for the passengers, such as boarding and in-flight service, will follow the operating carrier's policies, even though they booked through Frontier. Understanding this concept is crucial for travelers to know what to expect when they book flights that are being operated by other airlines.