The Metropolitan Transportation Authority is considering using aerial drones to track its 6,000-bus fleet — sparking outcry from transit union leaders, who call the plan a “fishy” spending waste.

The agency’s Department of Buses issued a document requesting information from vendors by Dec. 18 outlining how drones could be used to create a “real-time map” of bus locations and vehicle traffic patterns along service routes.

“DOB wishes to address the challenges of maintaining accurate and up-to-date vehicle location tracking for both its buses parked within depot buildings and outside in uncovered parking lots,” reads the document.