Higher costs and a shortage of available new parts are also delaying aircraft repairs, which risk pushing up air fares.
Some makers of brand-name parts like General Electric Co (GE.N) stand to benefit because they also sell used parts, known as used serviceable material.
Honeywell Aerospace Trading (HON.O), the U.S. conglomerate's used parts business, is among companies enjoying higher demand since 2021.
Ultimately, the alternatives to new parts may bring relief but a congested supply chain must be fixed, said Benjamin Hockenberg, president of JSSI Parts & Leasing.
"Certain models, certain situations, (used parts) will fill the void, but I think we also need to see a repaired supply chain," said Hockenberg.