Statistics for Biggest US Airlines by fleet

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Airline	# of aircraft in fleet	% Correct
American Airlines	969	98%
Delta Air Lines	893	96%
United Airlines	773	90%
Southwest Airlines	751	89%
Alaska Airlines	233	78%
JetBlue Airways	253	66%
Spirit Air Lines	128	66%
Frontier Airlines	96	55%
Hawaiian Airlines	56	55%
FedEx	687	37%
UPS	248	35%
Allegiant Air	81	34%
Sun Country Airlines	30	22%
SkyWest Airlines	471	21%
Republic Airline	189	12%
Atlas Air	39	10%
Envoy Air	181	10%
Horizon Air	79	9%
Mesa Airlines	145	9%
Air Wisconsin Airlines	64	7%
GoJet	54	6%
PSA Airlines	135	6%
Endeavor Air	186	5%
Compass Airlines	56	3%
ExpressJet Airlines	146	3%
Jet Aviation Flight Services	48	1%