|Chaos in the Skies!
Following the First World War, a number of countries, each operating independently, organized their own aerial postal services. Regular intercontinental flights consisted of a series of short flights, since long-distance flying was not yet possible.
Debates and controversies centred on negotiations over rights of way and landing rights (for supplies): there was a growing need for international guidelines that would apply to all countries. The Universal Postal Union organized a series of conferences and meetings in order to pave the way for such international cooperation.