The carrier has announced another round of changes to its loyalty program, saying passengers will only receive Loyalty Points and AAdvantage miles if they book directly with American, one of its partners, or a “preferred” travel agency. Flights booked elsewhere won’t earn miles.

The new rules go into effect in July.

At present, there’s no word on which agencies qualify as “preferred”—and it could be early June before that’s cleared up. The Wall Street Journal says that classification will depend “on whether they have adopted modern booking technology.”

“Booking with us provides a better travel experience,” the carrier argued in its announcement. “You can manage your trip online, receive travel credit for canceled trips and more. Plus, you’ll continue to earn miles and Loyalty Points through our non-airline partners and on eligible purchases with an AAdvantage credit card.”

Direct booking also lowers costs for the carrier.

For passengers who opt for basic economy fares, booking direct is the only way they’ll earn AAdvantage Miles or Loyalty Points. Preferred travel agency bookings will not be eligible.

American last announced a major overhaul of its frequent-flyer program in 2021, doing away with using how far or often someone flew to calculate status. That’s when Loyalty Points were introduced, which could be earned via travel or spending on branded credit cards.

Other airlines have followed its lead, with Delta announcing a big overhaul on its SkyMiles rewards program last year, which resulted in a bit of a rebellion among that company’s customers, forcing Delta to walk back some of its changes.

American noted that any existing reservations booked with third parties or non-preferred travel agencies will earn miles or Loyalty Points.