One of Michael Jackson’s biggest fans is SO CONVINCED there’s something fishy about his death … that she dropped $16,800 on her credit cards to have conspiracy-theory banners flown all over the L.A. area … TMZ has learned.

The message-towing planes mysteriously started buzzing L.A. 2 weeks ago with banners like, “FOLLOW THE $ TO MICHAEL JACKSON’S DEATH” … and “LAPD — HONOR BOUND TO TELL TRUTH FOR MJ.”

Sources connected to AirSign, the company flying the banners, confirmed to TMZ … a Hollywood costume shop worker paid for 11 flights over several locations including the downtown L.A. courthouse where Michael’s wrongful death lawsuit is going on right now.

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The woman, who wants to remain anonymous, tells us … “I’m hoping that someone will look at those messages and say, ‘If someone feels that strongly about it, maybe this is worth looking into.”

As for the massive cc debt … she says she can handle it because she’s single and kid-free.

And in case you think she’s totally nuts … she does have one connection to MJ. The shop where she works supplied some costumes for “This Is It.”

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