HOW TO FLY THE DODO:
Base controls: Hold W. Get some speed and while holding W, Hold NUM6 until you see the front tire start to spark from the lowness, Then release NUM6 but keep holding W. You are midair now. Click NUM6 on a steady rythm, Avoid holding num9 until you're about to land, as you'll just crash the plane, Click num6. then wait for the plane to go up then click num6 again, Repeat this until you want to land, Avoid any stunt jump points, Those ruin your flight. 
HOW TO LAND THE DODO:
Easy way: Just crash land it by hitting it into something or nosediving.
Soft way: Start holding NUM9, The plane may be unstable and need more NUM6s to be stable again, Do NUM6 + NUM9 until the plane is stable, Find somewhere suitable to land like a road or the airplane track and then gently, hold NUM9 until you fall. You've landed
HOW TO GET TO OTHER ISLANDS:
METHOD 1:Do the taxi glitch, Don't know that? Start Taxi Driver, then go to the junkyard and find the crusher, Park your car so that the passenger door is the only one free while the driver's dor is blocked. Then hold CAPSLOCK or your sidemission start button and then wait when the crusher's about to get your car, then enter it. You will see the car going up, but don't worry, Once the animation is over, you can stop holding CAPSLOCK and you have a ghost car, Congrats, You can now go to Stauton island, get a normal car or put the ghost car in a garage and back, then go to Shoreside Vale to get a dodo if you want to go back
METHOD 2 (Only possible on PC but this is a PC save file anyway so nvm): Go to the train tracks where you can see newports's Ports, then once you line yourself up forward with the ports in Newport (Image on the .ZIP file), replay mega jump, To replay mega jump, jog and then punch and click SPACEBAR, Immediately after clicking SPACEBAR, go and press F1, You should be moving really quickly, This glitch normally kills you but since i put 2147483646 HP and Armor you can easily survive it. METHOD 2 is very unrelaible if you don't know how to aim so i reccomend not doing it
HOW TO GET THE FBI CAR?
To get the FBI car, get 5 stars then at this point you should have completed vigilante, the reason is: Kill the FBI officials, then run and get at least 4 bribes to be safe, then run and put the FBI car into the garage, Close it if it fits, and reopen it to check, If the FBI car is there, you can save the game.