Which is exactly why most airlines do not have J class ZED. The ideal situation would be to sell ZED upgrade vouchers (e.g., x% of the ZL, ZM, or ZH fare for each zone), but that idea has not caught on, unfortunately. That way the employee buys one ticket (YIDZM) and one voucher for ZM zone 1, that the agent can return to the traveler if they cannot accommodated him in the higher cabin. Not sure, though, how that would work in an electronic enviroment.
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