This document discusses collaborative models for public and on-demand bus transport in India. It summarizes the landscape of bus aggregator companies in India and provides a case study on the environmental impacts of Shuttl operations in Delhi-NCR. The key findings are that Shuttl avoided 14,022 tons of CO2 emissions in 2017 and removed 4,312 passenger car units from the road per day. However, Shuttl customers tend to be educated professionals, indicating it currently caters to a niche market. The document raises questions about impacts in other cities and opportunities for public transit agencies and private operators to collaborate better.