Jolene is a twelve-year-old girl living in a small Phoenix apartment. She copes with intense daily stress by watching a desert aviation livestream and drawing detailed maps of the flight paths. A severe car accident two years prior left her with lingering anxiety and a fractured family life. She relies entirely on her own resourcefulness and internet connections for social interaction, a reliance that thrusts her into action when an online friend experiences a sudden emergency.

Addie is a twelve-year-old pilot who flies a small ultralight trike aircraft over the remote Alamo Lake desert. She learned to fly from her late father and continues the hobby to maintain a connection to his memory. She keeps her flight locations strictly anonymous, which presents a massive problem when her engine fails mid-flight.

Marty is a seventeen-year-old girl traveling by bus to check on her elderly grandfather in Quartzsite. She possesses a strong protective instinct and refuses to let a younger girl travel entirely alone toward a potential disaster. Though she asks pointed questions that frustrate her companions, she provides necessary practical support during incredibly difficult physical situations.

Madeline is a mother recovering from a severe car accident that occurred two years ago. She struggles with a chronic dependency on prescription oxycodone, which prevents her from maintaining steady employment or basic household routines. She spends most of her days sleeping, leaving her daughter to fend for herself.

Paula is Marty's mother and the founder of a charitable organization called Lucy's Hope. She works to support individuals dealing with heavy personal burdens and substance issues. She maintains clear communication with her teenage daughter regarding family responsibilities.

Joanie is a celebrated aviation pioneer and the first female commercial airline pilot. She frequently flies small planes out of the airstrip near Alamo Lake. She serves as a living example of the historical women Jolene and Addie idolize.

Aunt Mallory is a relative who briefly stepped in to care for Jolene following a traumatic car crash. She abandoned this responsibility unexpectedly, causing severe disruption in her niece's life. Her actions serve as the primary reason Jolene fears contacting authorities.

Mrs. Chapman lives in the rural desert region near Alamo Lake. She recently lost her husband in a vehicle accident and is raising her daughter alone. She is completely unaware of the dangerous aerial activities taking place outside her home.

This elderly gentleman lives in a mobile home in the desert town of Quartzsite. He requires periodic assistance from his family members to manage his daily affairs. His home provides a temporary safe haven from the extreme Arizona heat.