What ID90 means
ID90 typically means you pay roughly 10% of the full fare (i.e. 90% discount) on a space-available basis on your own airline. Policies vary by carrier, some routes, seasons, or ticket types have different rules.
What ZED is
ZED (Zonal Employee Discount) is an interline staff travel agreement used by many airlines worldwide. It standardises fares across member carriers so crew can fly on partner airlines at agreed discount levels (Low, Medium, High season bands are common).
Own airline vs interline
Traveling on your employer's metal is usually simpler: one seniority list, one dress code, one set of desk hours. Interline ZED travel adds variables. The operating carrier's load, their willingness to accept your listing, and sometimes different check-in windows.
Why crew compare notes on loads
Neither ID90 nor ZED guarantees a seat. Crew routinely ask colleagues who flew the same sector last week whether loads were light, when the employee desk opens, and whether certain flights are chronically full. That's the behaviour Layvr Staff Travel is designed to support, verified crew, structured load reports, one place.