An airmail stamp will have the word Airmail printed on it. In some cases a photo of an airplane is used. In earlier years, airmail was a sort of 'express mail' that would arrive several days before regular mail would. Today, it make less of a difference and is not common in the US.
3
$1.15 in any valid postage is fine. Just mark the envelope "airmail"
Well, honey, that stamp sounds like a 98 cent airmail stamp, not your regular old US postage stamp. It's meant for sending mail by air, so if you're just sticking it on a letter to your neighbor, you might be overpaying a tad. But hey, at least your mail will fly in style!
Yes, but you may pay more to mail the package if it only weighs one ounce, and you use a one ounce Airmail stamp.
44 cents (for up to one ounce) from anywhere in the USA. The stamp does not need to be specifically an airmail stamp since all the mail to Hawaii goes by airmail.
cost of airmail stamp on a postcard from usa to south Africa?
$1.05
No of course not! you'd need an airmail stamp.
NIS 5.90
32 cents
There is no difference between a donkey and a burrow
Well, you've got some problems with this stamp, namely that airmail in the US was not used (and even then it was a one-off event) until 1859! Indeed, the airplane would not be invented until 1903. And the first semi-regular airmail service in the US would not happen till 1911 and the first regularly scheduled airmail wouldn't start until 1918 in the US. So check your stamp and post a new question with accurate information.