Way get a fighter jet on demand

UPDATE: since the latest 1.0.3 patch, the quick replay has been removed. So sadly, from now on only the first completion gives 9000$, and every repeated run only 3000$.

"Violent Duct" from Gerald. It gives 9000$ and can be done solo in around 3-4 minutes. You have to be level 15 to start this mission. It is currently only the second best mission (as far as I know) to make money, but it's available from pretty early on and you can do it solo.

A few hints:

• do the mission on easy difficulty, you take less damage and still get the same reward
• a gun with high range comes in quite handy, get an AK-47 as soon as you have access to it
• flank them from the left side. As soon as you collect the coke, avoid the incoming enemies and just drive off the same way you came from

This mission was nerfed so it only gives you 3000$ per run after voting for repeat, but you can avoid that by pressing the R2 (quick restart) on PS3 (not sure about xbox, i guess right trigger) after rating the mission. The only problem with that is that you can't buy ammo between your runs. So bring a lot of ammo with you. If you run out of ammo, end the mission, restock and call Gerald until he gives you the same mission again.

I've done this in both online and offline and have a 90-95% success rate...

As soon as you hear the missile lock alarm, you want to perform a roll-off-the-top. As soon as the alarm sounds, pull back hard on the stick at full throttle to start your loop. The moment you are at the top of your loop, roll over so your fighter is level with the ground again.

When successful, you should see the missile pass high to your left or right and you have also broken visual contact with the other combatant.

Note - If you are just leaving the military base with the jet, especially online, after completing the roll-off-the-top you want to immediately drop your altitude to as close to the ground as possible, ideally over the ocean. This will prevent the base from getting another missile lock on you.