Whether it's US FAA part 121 time, or foreign equivalent is largely irrelevant to US airlines. They just care about the nature and quality of experience. Same for foreign military flight time. Obviously you need a US ATP.

The one place it would matter is for jobs involving direct-entry PIC at a 121 carrier (normally regionals)... those require prior FAA 121 time due to regulations (some 135 time also qualifies).