The Skinny
Use coupon /offer code ZTG7960642 to save 4-10% off flights booked at United. Refer to this slickdeals thread for more details. So far, every flight I have searched has offered a discount.
See the following example for a OW search NYC-HKG offering a 7.5% discount:
Non-Discounted Search
Discounted Search (using code ZTG7960642):
YMMV
Please post in the comments if coupon / offer code ZTG7960642 does not work for your location / dates. As you can see from the slickdeals thread, there is not much information available about this code, just that the code appears to be intended for Realtor.org convention participants.
Delta Discounts
Realtor.org also highlights a code for Delta flights, but it appears to be limited to certain locations/dates by the system.
“Delta Air Lines is pleased to offer special discounted airfares (5-10% discount) for the Conference & Expo!
HT: CSIG1001 @ SLICKDEALS
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United cancelled my ticket and threatened to close my FF acct from using this code. Be careful with it. I’d suggest you only use it for the dates of that realtor conference.