Stowaway
Yes Yes.... StowAway i remember, i remember cos of its CutScenes.... its not that hard...
Get to the Bike school at Las Venturas, near the stadium.. and increase ur bike skills.. once at a maximum, come back to Verdant Meadows...
Try setting the camera(usually the v key) to cockpit view(i hope u understand which camera angle i mean).. start the stowaway mission
Now u r on the bike..(and the camera is in cockpit view), press the accelerate key(up arrow), and the key u use to perform stoppie (usually the del key) simultaneously (the accelration of the bike increases cos of that) ... avoid the barrels and try to keep the bike as steady as possible without pressing the left and right keys much... this way u can easily get on to the plane..
PS: Also i was able to do it without achieving maximum bike skills, so u can try..
Also , if u r not able to get into the plane still, wait until there is a sandstorm, sandstorm causes the plane to take a longer runway, so u get more time....
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Another method:
Warning!! : this method involves cheat codes, dont use if u play without cheat codes..
type in the following cheats, before starting the stowaway mission..
CWJXUOC : Sandstorm cheat, benefit-> cos of the sandstorm, the takeoff time of the plane increases, and the plane only takesoff from the end of the runway
LIYOAAY : Slows the game speed, benefit -> cos of the slow gamespeed, u can easily dodge the barrels
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If u still unable to cross that mission, mail me the save file and i will cross that mission for u
Regards,

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