AI planes can be flown online without mods, but only through external (F2) view. As Icefire said, select a player controllable aircraft first, refly, and then select the AI aircraft.
If you are seeing the map, just press F2 and that should get you to your plane.
Keep in mind that this will not work on closed cockpit servers which do not allow any outside views such as Spits vs 109s and WarClouds.
The TB-3 however is a player controlled aircraft, so I'm not sure why you are having problems there.
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