SSIM service type codes: what J, C, F and P mean
The one-letter service type on every SSIM flight leg says what kind of flight it is. What the codes mean, how to group them, and the traps when filtering.
Active Flights · Blog
3 articles tagged #schedule-data.

The one-letter service type on every SSIM flight leg says what kind of flight it is. What the codes mean, how to group them, and the traps when filtering.

A field-level walk through the SSIM record types — header, carrier, flight leg, segment data, and trailer — with a sample file, the fields that matter, and the gotchas that bite parsers.

SSIM is how the airline industry exchanges its schedules — a fixed-width, 200-byte text format that's deceptively simple and genuinely hard to get right. Here's what it is and why it matters.