# Why there is no airport IATA code XXX?

It seems that there is no XXX IATA code: from Wikipedia, XVL (Vinh Long, Vietnam) is followed by XYA (Yandina, Solomon Islands). There is a source claiming that XXX used to refer to Mena Intermountain Municipal Airport, but from Wikipedia this place seems (rather strangely) to have no IATA code at all (and a source for this claim is given).

What are the reasons for not having the XXX IATA code? Is this a reserved combination? Has it belonged to the Mena Airport in the past, and if so, why has it been deregistered on October 21, 2014, as the source claims?

• There are plenty of three-letter combinations that are not IATA airport codes. Why do you think XXX might be special? – Greg Hewgill May 17 '16 at 20:29
• I often refer to McCarren International Airport as XXX. – RockPaperLz- Mask it or Casket May 18 '16 at 0:30
• XXX looks like a placeholder. – Pyritie May 18 '16 at 8:58
• Based on the IATA site Pondlife linked in his answer, DDD, EEE, FFF, III, JJJ, NNN, OOO, QQQ, VVV, WWW, and ZZZ aren't currently assigned, so there's nothing special about 3-of-the-same-letter combinations being used, either. In all, there are 17,576 available 3 letter combinations, so it's not surprising that they haven't all been assigned. – FreeMan May 18 '16 at 12:16
• Also, if you look at the "Overview" panel of information at your source that claims it used to belong to Mena, you'll see that the end-date of the information is the day before the start date of the information. That's likely an indicator of invalid data. – FreeMan May 18 '16 at 12:18

• @Mark Ah, the classic 'NULL' == NULL effect. – JAB Feb 28 '17 at 15:44