A dual-purpose stowage cart (20) for stowing a wheelchair (28) in a stowage bay (14) of an aircraft that was intended to stow a service cart (12). In at least one configuration, the stowage cart (20) includes an end assembly (24) and a base assembly (22) that are hingedly connected together. When the end assembly (24) is in an upright position, the stowage cart (20) may be used to transport a personally owned wheelchair (28) in an aisle of an aircraft. When the stowage bay (14) is not being used for stowing a service cart (12), the stowage cart (20) with the wheelchair (28) may be stowed in the stowage bay (14) in place of the service cart (12). Also, when the end assembly (24) is in the upright position, but the stowage cart (20) is without the wheelchair (28), the stowage cart (28) may include a waste collection assembly. The waste collection assembly is used to collect disposable waste from the passengers onboard the aircraft.