Hola Young Turk /
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If your airline permits landings with 15 kts tailwinds, I suggest that your flight operations management is seriously incompetent. With my airline, while the aircraft AOM (chapter 23 for the 747, I think it is the same chapter number in the 737) might show 15 kts on performance graphs, our GOM policies, limit any tailwind to 10 kts.
xxx
And despite that 10 kts rule, our crews have been instructed to refuse any takeoff or landing on runways when the wind component would exceed 5 kts!
xxx
Happy contrails