The car doesn't need them right now, but it's a good time to post since there have been a few threads on here lately about spark plugs and the topic is trendy now
Like most recent Japanese cars, the OE spark plugs are a twin-tip iridium design, NGK or Denso (the car might even have 2 NGK and 2 Densos in it now)
Unfortunately, they are so expensive! The parts stores charge $20 each, and the dealer charges $30
Bosch also makes an OE-spec iridium (they call it pin-to-pin), but it isn't any cheaper than the NGK.
Luckily, Denso also makes their Iridium TT for this car. Part #4712
(the OE Denso is also a twin-tip iridium, but Denso calls that one Iridium Long-Life SIP)
The aftermarket TT is less than $10 at Napa and Autozone. Pep Boys has it even cheaper, but they only have one in stock and probably won't be able to get the other 3 soon (see below)
Usually the Denso TT and the Iridium LL are priced about the same, rarely more than $2 difference
Rock Auto doesn't have either Denso in stock, and the Opticat lists both of them as temporarily unavailable
If Rock Auto carried the TT, it would probably be about $5 each. Hopefully Denso will be making them again when the car needs them. Denso usually costs less than NGK on their site.
This also means that independent parts stores that get their parts from Auto Value or Parts Authority don't have them and can't get them, either, as Rock Auto usually ships from warehouses affiliated with those two.
Rock Auto has the NGK iridium in stock, but they are still over $10 each, and you have to pay shipping.
When it is time to replace them, I will buy the new plugs from Rock Auto, Napa, AAP, or Autozone. I am aware of all the fakes out there on eBay and Amazon
So, is the aftermarket Denso TT ok to use on the 2013-2017 9th gen Accord Earth Dreams K24W?