@Sebastien: That's the thing, on the Dell XPS 15 9575 there IS a
regression with xkb-data 2.23.1-1ubuntu1.18.10.1.

On this machine, the airplane mode key worked perfectly out-of-the-box
(i.e., the key enabled AND disabled the airplane mode) with the
development version of  Cosmic, using xkb-data 2.23. See my comment #13
further up in this bug.

Here's the debug output for gnome-settings-daemon:

[*** Airplane mode is off, Wifi and BT are on ***]

/usr/lib/gnome-settings-daemon/gsd-rfkill -v
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:16.867: Read killswitch of type 
'WLAN' (idx=1): soft 0 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:16.867: Read killswitch of type 
'BLUETOOTH' (idx=11): soft 0 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:16.867: Added rfkill with ID 1
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:16.867: Added Bluetooth rfkill 
with ID 11
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:17.185: Registered client at 
path /org/gnome/SessionManager/Client29
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:17.187: Opened rfkill-input 
inhibitor.

[*** Here I am pressing the airplane mode key to enable Airplane mode >
Wifi/BT goes off ***]

(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:26.232: RFKILL event: idx 1 type 
1 (WLAN) op 2 (CHANGE) soft 1 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:26.232: Changed rfkill with ID 1
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:26.352: RFKILL event: idx 11 
type 2 (BLUETOOTH) op 2 (CHANGE) soft 1 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:01:26.353: Changed Bluetooth rfkill 
with ID 11

[*** Here I am pressing the airplane mode key again to DISable Airplane
mode > Wifi/BT should go back on. This fails and the airplane mode re-
engages immediately as described ***]

(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:03:11.523: RFKILL event: idx 1 type 
1 (WLAN) op 2 (CHANGE) soft 0 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:03:11.523: RFKILL event: idx 11 
type 2 (BLUETOOTH) op 2 (CHANGE) soft 0 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:03:11.523: Changed rfkill with ID 1
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:03:11.523: Changed Bluetooth rfkill 
with ID 11
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:03:12.394: RFKILL event: idx 1 type 
1 (WLAN) op 2 (CHANGE) soft 1 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:03:12.394: Changed rfkill with ID 1
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:03:12.394: RFKILL event: idx 11 
type 2 (BLUETOOTH) op 2 (CHANGE) soft 1 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:03:12.394: Changed Bluetooth rfkill 
with ID 11

[*** Here I am pressing DISabling Airplane mode from the Gnome panel
menu > Wifi/BT goes back on. This works ***]

(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:05:10.298: RFKILL event: idx 1 type 
1 (WLAN) op 2 (CHANGE) soft 0 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:05:10.298: RFKILL event: idx 11 
type 2 (BLUETOOTH) op 2 (CHANGE) soft 0 hard 0
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:05:10.298: Changed rfkill with ID 1
(gsd-rfkill:18272): rfkill-plugin-DEBUG: 19:05:10.298: Changed Bluetooth rfkill 
with ID 11

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https://bugs.launchpad.net/bugs/1740894

Title:
  KEY_RFKILL is not passed to userspace

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https://bugs.launchpad.net/ubuntu/+source/libxkbcommon/+bug/1740894/+subscriptions

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