White Eagles & Firebird — Elizabeth Wein

White Eagles: Summer 1939. With Europe on the brink of war, 18-year-old Kristina Tomiak has been called up to join the White Eagles, Poland's valiant air force. When the Nazis reach the town where she is based, Kristina makes a daring escape, but she doesn't realise that she's carrying a stowaway in her plane. Will Kristina be able to navigate the most challenging flight of her life and reach safety amid the turmoil of war?Firebird: Nastia is no traitor. She is a fearless pilot, the daughter of revolutionaries, and now, as the Second World War descends on Russia, she must fight to defend the glorious Motherland. But all is not as it seems and when the battles begin, secrets are revealed and everything that Nastia once knew is challenged.