Aircraft sends interesting number message

ACARS is Aircraft Communications Addressing and Reporting System. The originating aircraft, registration number VP-BWA is an Airbus 319-111, was on its way from Vienna to Moscow, when it transmitted classical number groups extremely typical and consistent with modern shortwave radio's number stations. My properly informed friends tell me that international regulations do not allow the ACARS to be used for espionage purposes.

The typical content of an ACARS message is an estimated time of arrival, a 4-character airport code, and some terse, telegraphic readable content.

Don't ask me how I got this :-)