What is the significance of planes in the novel, Code Name Verity?

Planes are symbolic of Maddie’s abilities and the heights (metaphorical and literal) that she is able to reach when she is not held back by gender stereotypes. Maddie’s affinity with planes changes her life in many ways beginning with the chance to learn how to fix their engines and train for her pilot’s license through her connections with Dympna Wythenshawe. These experiences ensure that Maddie is able to do all sorts of things that women were not supposed to be involved with during the war including flying Queenie to France and becoming involved with the efforts of the French resistance.