With news that JetBlue is expected to announce its next major airline partnership in the coming months, speculation over which airline that will be — and what it will mean for frequent flyers — is swirling.

JetBlue Airways and United Airlines have been negotiating a partnership, three industry sources familiar with the matter told Reuters.

American Airlines on Monday sued JetBlue Airways in the Business Court of Texas to recover funds that JetBlue allegedly owes from the failed Northeast Alliance partnership effort.