Why does a plane flying over my house seem to interrupt my wifi?
WiFi signals operate on a different frequency band (2.4 GHz or 5 GHz), which is significantly higher than the frequency range used for aircraft communications and navigation (typically in the VHF and UHF frequency bands).
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Aircraft must fly over residential areas because of the small distances between some airports and neighborhoods. Therefore, it is sometimes necessary for aircraft to fly over these residential areas in order for aircraft to safely reach the airports.
Despite the urgings of flight crews to turn off all phones or put them in airplane mode, cell phones can continue to work after a plane takes off, but only while in range of a cellular tower. Cell phones communicate through cell towers, which are located on the ground but can stretch hundreds of feet into the air.
Your phone is not necessarily going to cause the plane to crash. But you will annoy the pilots and air traffic controllers. And that annoyance could be enough to distract them. On the ground, cell phones operate at a fairly low power.
Can I text on an airplane? Yes, but only using a Wi-Fi connection. The ban on using a cellular connection means passengers can't send SMS texts. Any communication has to be over Wi-Fi with a messaging app that provides similar functionality like iMessage, WhatsApp, or Viber.
The typical maximum range of an ultra-long-range aircraft is 13 hours; with a second set of crew, you can enjoy an extra three hours without stopping for fuel.