Actually the labels can be get free from the post office normally.
Here you are, first showing the Airmail label from Malaysia. MEL UDARA is Malay language means the Air Mail. Actually from this small labels can also learning different language and i think the labels is very unique. Different for each country and may with different language writing of Air mail.
This is the new version of Malaysia airmail label.
Size of this small label :40mm* 20mm