Tomorrow morning, I'm flying IAD-BOS on UA 860. It's supposed to be a 757. I often play around on Flightaware just to see where my plane is coming from. However, today something strange happened. When I click "Track inbound flight" on Flightaware I get a 763 coming in from ACC. I then went to United Cargo and it definitely says 76I for my flight tomorrow. However, I can still access the seat map in my res. as a 757.

Which is the trustworthy source?


ps. According to Flightaware and United Cargo, UA 577, BOS-SFO, is also getting the equipment change to 76I.