I've only done LAS-LAX and ORD-ORF. Surprisingly despite all my United flying, I've never flown IAD-IAH.
Edit: Also done KWA-KSA as listed below.
Edit Again: Did fly IAD-IND once for a medical diversion.
Chris
Last edited by JayhawkCO; Sep 3, 2019 at 11:25 am