What gta online missions feature michael franklin and trevor?

The available evidence confirms that Trevor Philips appears in Grand Theft Auto Online as a character from GTA V, but it does not list any particular online missions that also include Michael De Santa and Franklin Clinton. Because the source does not enumerate mission details or collaborative appearances of all three protagonists in GTA Online, we cannot identify any such missions with confidence. If additional sources are consulted, they may reveal specific contact missions or Heist setups where the three characters are referenced, but that information is not present in the verified content provided.