This is more for the Wolfram personnel reading the forums (Already submitted to support):
The FlightData[] function is returning inaccurate information by returning ICAO flight numbers as tail numbers instead for several ICAO carrier codes. The list below are the ones I identified thus far just looking at an output for KMCO→All: 
 
NKS = Spirit Airlines  
MXY = Breeze Airways   
ROU = Rouge (Air Canada)  
SIL = Silver Airways  
NCR = National Air Cargo
JRE = flyExclusive
CSB = 21 Air
I'm also noting numerous duplicates in the function response that can't be removed with a simple DeleteDuplicates@ in the front.
				
					
				
				
					
					
						
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