JetBlue Airways is again raising fees for checking bags by US $5 to US $35 for the first one and US $40 for the second, on flights within the United States. Passengers can avoid the increase if they pay for up to two bags at least 24 hours before their flight.

JetBlue spokesman Derek Dombrowski said Friday that the airline believes that “it makes sense to charge for the added services that only certain customers use,” while not charging for other things such as on-board TV and Wi-Fi.

Dombrowski added that the US $5 discount for those who pay bag fees ahead of time should cut down on transactions in the airport lobby and make for a better travel experience.

The changes took effect for tickets bought on Thursday and were posted on the airline’s website.

Passengers who buy certain more expensive types of tickets and those with a JetBlue-branded credit card do not have to pay the fees.

Many US airlines have been charging for checking one or two bags for more than 10 years, with Southwest being the major exception. New York-based JetBlue raised the fees by $5 in 2018, and other airlines quickly followed suit at the time.