Insufficiently paid for Air Service – Sri Lanka Aerogramme 1966.
Ceylon Issued a 30 Cents Aerogramme with the coat of arms design in 1966 when airmail rates from Ceylon were 30 Cents. This aerogramme was used in 1968 when the aerogrammes rates were revised to 50 cents and it was marked as “Insufficiently paid for Air Service” by Postal authorities and posted /delivered through land/sea route.
Bangladesh gained Independence from Pakistan in 1971 and one of the First Aerogrammes to be used by Bangladesh was a 30 Paisa Pakistan Aerogramme overprinted Bangladesh in English and Bengali. It has a Philatelic Bureau Dacca postmark of 23 Feb 1972. The stamp design of aerogramme features an aircraft.
Bhutan Post issued a 3.50 Nu Aerogramme possibly in 1989 as per cancellations studied by experts. The Aerogramme features a Bird and Flower in stamp design and an aeroplane over a mountain in cover design.