 To ensure that an aircraft can be flight-ready within 30 minutes, hot-spare aircraft are preflighted and fueled ahead of time.In 2014, UPS launched 275 hot spares in total, allowing 1.5 million packages to make service on time, making almost $32 million in revenue., UPS Airlines was experimenting with a Global Positioning System-based landing procedure, called Continuous-Descent Approach at the Worldport, replacing the traditional holding pattern and step-wise descent.