What does the faFlightID constitute of ?

FlightAware AeroAPI
1

Hi folks,
We have recently started exploring flight aware api data and stumbled up this attribute called faFlightID which looks something like
AAL202-1473139540-airline-0402 or AAL202-1473139540-scheduled-0402

Here AAL202 is the flight number.
What does the timestamp represent?
What does airline (or) scheduled represent?
What does the number 0402 represent?

Please help.

2

The faFlightID is an opaque identifier that is generated internally by FlightAware. The components of the identifier are not intended to have external meaning and should not need to be parsed by users. The format is not guaranteed and is subject to change at any time.