Because they are considered a weapon Scissors are not permitted in the cabin baggage of a passenger and airport security will handle in cooperation with the airline agent the case. It is permitted though in the passenger's checked baggage.
Depending on the size. Scissors with blades shorter than 4 inches are allowed.
TSA: Prohibited Items
http://www.tsa.gov/travelers/airtravel/prohibited/permitted-prohibited-items.shtm
No, it might depend on the company you are flying but you can't on BA.
No because its considered a weapon.
Yes. Provided the bottle is 100ml or less and you put it into a resealable clear plastic bag.
17.9 inches is less than 18 inches.
Inches are less than feet.
yes it is less
less than 18 inches 2 feet = 24 inches so 18 inches is less than 24 inches
5% less than 12 inches is 11.4 inches.
40 inches is less.
No, the plane would weigh the same.
Yes it is less.
It isn't less. It is 10x more.
It is 40 inches because 4 feet equals 48 inches
1 yard = 36 inches so 28 inches is 8 inches less than a yard.