AirCanada:
Airbus 319 - Economy
Scenera - RF in window seat - no issues; used seatbelt extender to make it easier
Original Marathon - FF in window seat - no real issues; despite using the seatbelt extender, I still found buckling the extender in upside down for the MA seemed to work better than right side up; the MA sits very high on the seat and contouring of the plane's seat back works a bit against it - I used the semi-reclined position; tray table was somewhat useable but not flat
Airbus E90 - Economy
Scenera - FF in window seat - no issues; used seatbelt extender to make it easier; installed with footprop in RF position (folded in) to make sleeping easier; tray table was somewhat useable but not flat
Original Marathon - FF (window seat?) - no real issues; despite using the seatbelt extender, I still found buckling the extender in upside down for the MA seemed to work better than right side up; the MA sits very high on the seat and contouring of the plane's seat back works a bit against it - I used the semi-reclined position; tray table was somewhat useable but not flat
CARES - window seat for child: 23 months, 25 lbs and just shy of 33"
The harness was adjusted close to as short as it will go. He stayed in it watching the TV only about long enough for me to get a few pics (10 minutes max?) and was constantly complaining that the red belt was bugging him - with the contouring in the seat back it was floating and digging into his back/neck/head - could not find a comfortable position (he was grumpy and slouchy). The lap belt was riding too high, mainly because he kept slumping down, and was not really snug. As mentioned above, there was no way to tighten it any more and it was just laughable having such wide spacing across those tiny little hips. He could probably have climbed out of it easily if I had let him continue to try. I don't think it works well for small kids like this. However, if it was a choice between CARES and just the lapbelt, I would definitely bring the CARES!
Lot Polish Airlines (code-share through Air Canada):
Boeing 767 - Economy
Scenera - FF in window seat
Plane #1: no issues; used seatbelt extender to make it easier; installed with footprop in RF position (folded in) to make sleeping easier; tray table was somewhat useable but not flat
Plane #2: Similar, but the seatbelts seemed different, with a longer non-adjustable section? and even with the belt extender the buckle was sitting almost on DS2's back.
Original Marathon - FF in center seat
Plane #1: no real issues; despite using the seatbelt extender, I still found buckling the extender in upside down for the MA seemed to work better than right side up; the MA sits very high on the seat and contouring of the plane's seat back works a bit against it - I used the semi-reclined position; tray table was somewhat useable but not flat; snug fit against armrests so I installed with the armrests in place rather han trying to force tham back down past the shell
Plane #2: similar, but I had a few skinned knuckles from installing the MA with the different seatbelt geometry (longer non-adjustable section so that the extender buckle was in the middle of the beltpath)