Altus, OK

Return flights were originally UA 5567 OKC–ORD / UA 5493 ORD–DAY, but the first flight had to return to OKC due to a maintenance issue.

Section	Flight	Route	Departure
Section 1 DAY ⇒ OKC	United 3937	DAY ⇒ ORD	21 May 2019
	United 5393	ORD ⇒ OKC	21 May 2019
Section 2 OKC ⇒ DAY	United 5567	OKC ⇒ OKC	23 May 2019
	American Airlines 4581	OKC ⇒ PHL	23 May 2019
	American Airlines 5020	PHL ⇒ DAY	23 May 2019
5 flights (0.4% of all flights)