Please edit this info in the Wiki with additions or corrections.
All airlines: No carseats in the exit row, in the row in front of the exit row, or in the row behind the exit row.
Carseats must go in the window seat or in the middle of the middle section.
Air Canada:Policy on website: Carseats not allowed lie-flat Business Class. Some exceptions apply
{Please post if you know what these exceptions are}American: Policy on website: No restrictions.
F/A manual: Carseats not allowed in direct aisle access business or first class on any plane with direct aisle access including A330, A350, 772, 77W, 787 due to the seats being angled more than 18 degrees from the aircraft centerline.
Cathay Pacific: Policy on website: Carseat allowed in first class, premium economy, and economy.
Carseat allowed in all classes on the A350.
Only a specially reserved Cathay Provided Child Restraint seat allowed in business class on the 77W, A330 or A340.
No seats allowed in business class on the 772.
Only a specially reserved Cathay Provided Child Restraint seat allowed in coach on the A340.
Delta: Policy on website: Carseats not allowed in business class on A330-200 or A330-300; Boeing 777, 767 or 747 aircraft due to airbag seat belts.
El Al:Policy on website: For safety reasons, it is possible to purchase a business class seat for an infant in the 787 fleet (Dreamliner) but it is not possible to install a baby seat in this seat. (
https://www.elal.com/en/PassengersInfo/Useful-Info/SpecialNeeds-Passenger/Pages/Infants.aspx)
F/A manual:
{Please fill this in if you know the 787 policies}JetBlue:Policy on website: No restrictions.
F/A manual: Mint class and EMS seats on newer aircraft have airbag seatbelts. Conflicting info from F/As on whether a seatbelt extension permits the use of a carseat in an airbag seat.
No issue on the older planes that alternate 1 or 2 seats per row, the newer ones with the angled seats seem to be an issue.
United: Policy on website: Carseats not allowed in Global first class, or in any rear facing seat.
F/A manual: Carseats not allowed in business class on the 77W due to the seats being angled more than 18 degrees from the aircraft centerline. Unknown why this applies to the forward facing seats.
Swiss:As per personal experience, no issues on the A330 however need to be in rows 4 or 6 as they don't have an airbag in the seatbelt.