Which city is HTX?

Excuse me, but I'm a bit confused. Could you please clarify which city you're referring to when you say "HTX"? Is it a commonly known abbreviation or acronym for a specific city? I'm not immediately familiar with this designation, so I'd appreciate it if you could provide some additional context or information to help me understand better. Alternatively, perhaps there's a mistake in the spelling or formatting of the abbreviation, and we can work together to figure out the correct city. Thank you for your patience and cooperation.