Narrative:

Descending on the btsey 2 arrival into clt for 36L. After btsey the controller cleared us to cedox. We thought we heard defox on the 36L localizer. We tried to query the controller; but the radios were so congested that we couldn't get a word in. Before we had a chance to ask; the controller gave us a heading for downwind. As we started to investigate; we found cedox on the parqr 3 arrival. We noticed that the parqr 3 is one of the sids that we are unable to fly. The pm; on initial check-in gave the controller all of the required information including the SID we were on and the transition.recommend changing the name of either cedox or defox. They're too similar to be that close together.

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Original NASA ASRS Text

Title: Air Carrier Captain reported a track heading deviation during arrival to CLT airport due to similar sounding fix names CEDOX and DEFOX.

Narrative: Descending on the BTSEY 2 Arrival into CLT for 36L. After BTSEY the Controller cleared us to CEDOX. We thought we heard DEFOX ON THE 36L Localizer. We tried to query the Controller; but the radios were so congested that we couldn't get a word in. Before we had a chance to ask; the Controller gave us a heading for downwind. As we started to investigate; we found CEDOX on the PARQR 3 Arrival. We noticed that the PARQR 3 is one of the SIDs that we are unable to fly. The PM; on initial check-in gave the Controller all of the required information including the SID we were on and the transition.Recommend changing the name of either CEDOX or DEFOX. They're too similar to be that close together.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.