No.
No, they must be in your carry on luggage.
They don't make pressurized suit cases but if you tighten your lotion top enough there should be no problem.
No Australian quarantine laws are very rigid if you do bring any food with you declare it at the point of entry or you could get a fine
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.
You can't put it on carry-on luggage, but you can put it in the luggage that goes under the plane
Plane-side is a derivative of gate-check in terms of luggage. Plane-side luggage is generally used to describe luggage that was gate-checked, but left on a designated cart next to the stairs of a small aircraft. This cart of luggage is then taken and loaded into the cargo hold of the aircraft. Upon arrival, the luggage is taken off first and carted to the aircraft stairs for passengers to retrieve.
NO
Here's a list of items you cannot take onto a plane with you. http://www.tsa.gov/travelers/airtravel/prohibited/permitted-prohibited-items.shtm I didn't see hairspray on the list. But last time I flew on a plane youre not even allowed to have small amounts of liquid on your carry on or checked baggage.
yes
As long as your infant has a plane ticket, their luggage is aloud. However, for certain items you may have to consalt the plane board, or someone at the airport.
Provided they do not exceed the cabinet weight and size limit, in theory yes, speakers can be taken on a plane in hand luggage.
No, it will not. Even sparkling wines are safe in the plane because they are not shaken nor is the temperature is high.