How can electronic devices be FCC compliant to not cause interference yet can interfere with airplane communications?
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FCC complaince means it meets their standards. It does not mean the device has an exclusive claim to a particular frequency.
Many devices (especially hardware on planes) share frequencies and tech with stuff like phones. To avoid extra noise it is best to reduce any extra signals. Especially in a situation like take off/landing when they really need the info to come in clear.
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