I've got to be in the 5 percentile of people that actually enjoyed Zero's missions in San Andreas.
The roof top plane mission was easy once you realized that all the targets were clustered within the same location with one Target being the farthest away. THAT's the target you should fly to last since it takes up the most fuel. Any other strategy and you run the risk of having the other targets disperse to the point you're chasing them through the winding streets and wasting time/fuel in the process.
The battle mission against Berkley was just simple shyt you should have already gotten the hang of provided you played (and beat) the mission of similar nature in Vice City if you were fukking with the GTA series.
The most fradulent flying mission of all time in the GTA series is in Vice City where you got to fly through the Coronas with the plane dumping those flyers for the Candy Suxx event.
It's long, hard (double pause) and stressfull 'cause if you fukk up once, that's you having to re-do the whole silly thing again.
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Rest easy, King.