Luke, there is a disturbance in the force.
A knowledge of the UDP (User Datagram Protocol) is helpful here.https://en.wikipedia.org/wiki/User_Datagram_Protocol
As stated in the article, this is a protocol without handshaking so lost packets are not recovered. They are accounted for in that the packet contains a count. If the receiving site does not have a matching count then packets were lost.
Wireless Ethernet is much more susceptible to packet loss than wired. RF interference between your Flightfeeder and your Wireless Access Point can cause packet loss.
Recently I experienced UDP packet loss and thought my network wasn't the problem. I then discovered that the access point device that my RPI was connected to was dying a slow death. Once it bellied up, my connection to FlightAware improved when the RPI connected to a different access point.