[size=18]Step 1) Steal a Jumbo Jet with a story mode character, and land it at Trevors Airstrip. Then, save your game.

Step 2) Switch to an online character, go to Trevors Airstrip and position yourself beside where you saved your storymode character in the jumbo jet. Make sure "spawn at last location" is set on, then switch back to any story mode character, and then back to your online character again.

Step 3) You should spawn at Trevors Airstrip with your online character, go to the xbox or ps3 store, and as it loads up, sign out of your xbox/ps3 account.

Step 4) The prologue mission should load up, sign back into your account, and then load up the story-mode save game where you are at Trevors Airstrip in the jumbo-jet.

Step 5) Switch back to your online character, yes you can join a public lobby, and you should spawn at Trevors Airstrip with the story-mode jumbo jet right beside you.

I used Trevors airstrip because it was a nice, easy place to land with the jumbo jet while in story-mode, that you could also spawn directly on with your online character. You could use other locations. If you are confused, check out the video. Have fun!