In article ,
"Mortimer Schnerd, RN" wrote:

Newps wrote:
Flying in clear skies does not require an instrument rating.

At 30,000 feet it does

Why? What does altitude have to do with it?

Airspace between 18,000 feet MSL and Flight Level 600 is designated Class A
airspace and all operations there must be conducted under IFR.

http://www.asy.faa.gov/safety_produc...spaceclass.htm

....so the hijackers couldn't possibly have done it, since they might
have faced some severe fines or jail time if they got caught flying
those planes illegally when they crashed them into the towers.