yes
Provided they do not exceed the cabinet weight and size limit, in theory yes, speakers can be taken on a plane in hand luggage.
you can
NO!
Checked luggage is that which has been checked in: weighed, labelled, and taken away to be loaded onto the plane. You don't see it again until you have landed at the other end and the plane is unloaded. Hand luggage is that which you can take onto the plane with you and have access to during the flight.
Yes you can,
Yes you can. No problem.
Viagra is a medication that is prescribed by many doctors. Therefore, it can be taken on a plane. It can be taken in the suitcase or carry on luggage.
I think you are allowed knitting needles in your luggage that goes into the plane hold (main luggage), but you are not allowed them in your hand luggage because they can be classed as dangerous. If you want to knit on the plane, I have used pens before. If you use some thin pens or pencils, that should work.
Free hand cargo can be interpreted as the luggage a passenger can carry on to a plane for free. It also can be a type of shipment that uses robots instead of people.
can we bring our ps3 on hand luggage
Why do you need hairspray with you on the plane. I'd think no aerosols on the plane all together is a good rule. Hairspray is cheap, if you really need it pick some up when you arrive at your destination.
No, usually the checked weight is different from the weight of the hand luggage. Check with your airline