Hi, I had the same question when we flew a few years ago, so I did some research.
Car seats made in Canada may not show the FAA approval, however if it is manufactured here it will be okay. We have a higher standard for testing.
I had an Evenflo seat and I printed off some info from the website regarding carseat approval for Canadian made seats.
I found this info from Transport Canada:
Labelling Requirements - restraint systems which are manufactured or sold in Canada must be affixed with a Statement of Compliance label which states that the system has been certified to CMVSS 213 or 213.1 and indicate the date of manufacture as being after January 1, 1981.
Seats manufactured to US standards between January 1, 1981, and February 25, 1985, must bear the label: "This child restraint system conforms to all applicable Federal Motor Vehicle Safety Standards."
Seats manufactured to US standards on or after February 26, 1985, must bear two labels:
"This child restraint system conforms to all applicable Federal Motor Vehicle Safety Standards"; and
"THIS RESTRAINT IS CERTIFIED FOR USE IN MOTOR VEHICLES AND AIRCRAFT" in red lettering.
In the United States, regulations require a separate label certifying the device for use in aircraft, as American manufacturers are only required to conduct an inversion test if the manufacturer wants to certify the device for aircraft use. Canadian manufactured child restraint systems do not require a separate label stating certification for use in aircraft as it is a requirement for all devices to successfully complete an inversion test
Here is the link
http://www.tc.gc.ca/CivilAviation/co...ars/AC0177.htm
I printed it out and put it on the back of the seat where the manual goes, just in case anyone questioned it.
No one ever asked to see a label or anything when we boarded.