So let me throw this out there:

Alt I

Chicago, visit to the Hyatt world HQ, United world HQ + tour of airport facilities,

Charter ORD-YUL, visit to Air Canada and Bombardier

Charter YUL-DEN, end up in Denver for a very special event


Alt II

Houston, visit to United Airlines

Charter IAH-GRU, visit to TAM and Embraer

overnight

Charter GRU-DEN, end up in Denver for a very special event

Pricing, Alt I: Y: 699, F: 1999
Pricing, Alt II: Y: 849, F: 2599