MSGID: 2:221/360.0 69032208
REPLY: 2:221/1.0 68f3c65a
PID: SmapiNNTPd/Linux/IPv6 kco 20251012
NOTE: Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32)
CHRS: CP437 2
TZUTC: 0200
I wrote:

AS> This usage needs no excuse, being perfectly correct.  Here a
AS> combination of a preposition and a noun in the objective
AS> case acts as a unified proposition, cf. /on top of/, /in
AS> place of/, &c.  Observe also the title of a Dunany short
AS> story, /Thirteen at table/, where /at table/ is singe united
AS> proposition.

All of
   at work
   at school
   online/offline
   offroad
   on air
   out of band signal (of exceptions)
are instances of this phenomenon.

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