X-Wing series (Wraith Squadron Arc) by Aaron Allston
In the fifth-through-seventh books of the X-Wing series, the story shifts to cover Wraith Squadron, a group of misfits brought together by Wedge Antilles to be combination fighter pilots and special operatives. They soon find themselves in a series of high-spirited adventures against dangerous Imperial adversaries, by the end coming under the command of the famous General Han Solo. Author Aaron Allston made his Star Wars debut with this series of fan-favorite novels that skillfully combine laugh-out-loud humor with vivid emotional realism and well-developed characters.
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Book 5: Wraith Squadron
Book 6: Iron Fist
Book 7: Solo Command
Story of Wraith Squadron continued (decades later) in The New Jedi Order series and X-Wing: Mercy Kill.
This is a post-Return of the Jedi series from the Legends timeline. Think of it as an alternate universe from The Force Awakens and newer books.