I understand that the policy for how to use the vouchers is unchanged (at least in theory, as CSR's and managers still try to limit it's use to only one leg of married segments), but I'm wondering if the actual seat availability is being limited more. I booked flights from IST-NBO roundtrip 6 months before the flight and there was no availability for vouchers, but there was availability for using miles for upgrade. I never had issues that far out to use my vouchers. Is voucher seat availability different than mile upgrade seat availability?