No they could not unless they had the backing of someone wealthy to pay for the ships
Yes they could. People cross the ocean in small boats all of the time. And just look at the Pacific? All of those islands were colonized by people with Stone Age level tech. It's not a great analogy to space, but surely you don't need a billion dollar rocket to get into orbit. Surely it can be made more affordable, and that's what they're trying to do.
All focus on destroying the opponent's will to fight, rather than his ability to fight.
And yet, this didn't seem to be what 9/11 was about at all. Nor the previous WTC attack, nor the attack on the Cole. Actually, the more I read your reply, the more you seemed to strengthen my point that their true motives cannot be simply gleaned from a word.
Regardless, they are called "terrorists" because their strategy is not to defeat through superior military power, but to instill terror into the populace.
Terrorist is a pejorative term applied to them by the targets of the violence. They don't call themselves that. You can't determine their strategy with insults.
Due to extreme difference in altitude you can't shine into the cockpit, the pilots eyes, or disrupt the craft or the flight in any way.
Where did you get this? If the pilot can see the ground, there's a direct line of sight with some guy with a laser.
Pound for pound, the amoeba is the most vicious animal on earth.