Aleksandra "Sanya" Vladimirovna Litvyak (サーニャ・V・リトヴャク, Sānya V Ritovyaku?, Александра Владимировна Литвяк) is a Night Witch of the 501st Joint Fighter Wing, originating from Orussia and affiliated with her home unit: the Imperial Army of Orussia’s 586th Fighter regiment. Her familiar is the domestic cat. Her mild personality and nocturnal lifestyle give her a "ghost like" impression.
Her Magic Antenna (魔導針, Madō Shin, lit. "Magic Needles") allow her to interact with radio waves. It is a type of non-visual perception that can detect objects at extreme ranges. Also can use a spell to provide guidance cues to other witches and aircraft and is able to tune in and rebroadcast radio transmissions.
Sanya based on Russian flying ace Lydia V. Litvyak, one of only two female aces of World War II and the only female pilot out of the pilots the witches are based on. Both share the name "White Lily of Stalingrad"; a nickname that may have been influential on the color choice of Sanya's hair.
 Wikipedia: Lydia V. Litvyak