Unless, of course, the airliner is also using a FLARM.

Of course, right now they're not and I'm the
first to admit that we do have a long way before we get there
(provided we want).

However, in Europe lots of commercial operators are in fact starting
to adopt FLARM simply because they know that they can avoid
gliders that way. Not only SEP 2t. Also, light GA is gaining momentum.

FLARM is *not* a replacement for see-and-avoid. You need
to maintain lookout just the same as if you hadn't installed it.
That's covered in all the manuals. Consider it an 'attention trigger'.

FLARM's added value is mostly in less crowded areas: It's hard
to overlook 20+ gaggle. It's much less hard to overloog a single
white glider approaching head-on against a background of mountains
and snow, or against the sun.

Best
--Gerhard (FLARM dev mgr)