X-Wing: Starfighters of Adumar

X-Wing: Starfighters of Adumar by Aaron Allston
This late installment in the X-Wing series is remembered by fans as a masterpiece of humor mixed with seriousness. The story focuses on Rogue Squadron old-timers Wedge Antilles, Hobbie Klivian, Tycho Celchu, and Wes Janson, sent to earn the loyalty of a long-lost planet that now must decide between joining the New Republic or the Imperial Remnant. The mission will prove to be a test of the pilots' diplomatic skill as well as their flying expertise.

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This is a post-Return of the Jedi novel from the Legends timeline. Think of it as an alternate universe from The Force Awakens and newer books.