Strange that you say it will be the default Baron/172. For me he showed up as the Lear when we were flying last night. I just didn't have time to download the 757 he has and he doesn't know which one he has.
If both of you are not using any of the default aircraft, then pre-arrange for both of you do download, and install EXACTLY the same aircraft, and then try it out....

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The system only works successfully if both of you, (and everyone else!), have EXACTLY the same aircraft, with the same textures, in your/their Hangar...

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Paul...G-BPLF... 8-)...!
When you have done the above, go into "External View" mode and check with each other that the expected aircraft are displayed...

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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.