Common terminology for airports, opposes 'air side'.

HOWEVER, as Anca says, the distinction being made here is clearly with the LOCAL (= domestic) land side; it remains to be seen what it is being used to oppose here, as it may well indeed been pays / étranger.

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Note added at 2 jours2 heures (2014-05-07 10:02:37 GMT)
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In another forum, Asker has confirmed that their document does also include 'côté piste' (= airside)

In the light of that information, my confidence level would have been higher!

Of course, the use of 'pays' does tend to suggest specifically an international airport.