Toaru Hikuushi e no Tsuioku

Charles, a mercenary pilot of the Levamme Imperial Air Force, received an secret order. "Fly 12,000 kilometer across the sea in the middle of the hostile territory and send the Princess securely to the main land." He fought against a devastating number of fighters and overwhelming battleships to protect Princess Fana. This is about a forbidden love between an orphaned pilot and a girl with an unchangeable destiny.
Ranked tenth in the 2009 edition of "Kono Light Novel ga Sugoi!"
(Source: MAL News)