There is rarely a single specific issue a reporter writes about that provokes huge interest from its first mention, and then continues to do so for months on end. For loyal customers of United Airlines, however, the carrier’s blocking of “award” seats made available by its partners in the global Star Alliance is not just any issue.

That was evident as soon as this column exposed the previously secret practice in September, as hundreds of members of United’s frequent-flier program, Mileage Plus, complained either to me or the airline. Although I haven’t dedicated a column to the issue since early December, I continue to receive e-mail messages about it. I also try to answer some questions in a thread on FlyerTalk…