The District of Columbia U.S. Court of Appeals recently ruled Friday that the FAA must show actual data to back up its unsupported assertions about the safety of tightly-packed airline seats. In effect, the decision at least temporarily reinstates a part of Flyers Rights' original petition asking FAA to issue minimum seat width and pitch rules for airlines in the U.S. This could turn out to be a win for consumers, but it isn't yet.

Flyers Rights filed its original petition in 2015, asking FAA to issue rules governing minimum seat sizes and spacing on commercial aircraft. The petition noted that, since the 1960s, airline seats had grown smaller while passengers had grown larger, and it claimed that minimum standards were required to protect passengers' safety and health. The safety argument centered on ability of travelers in packed high-density economy cabins to get out of survivable crash quickly enough; the health argument centered on the possibility of deep vein thrombosis and other adverse health effects.

RELATED: A Quick Guide to Airline Seat Width

In its initial response, the FAA denied and dismissed the petition. The denial on the safety grounds asserted that FAA had access to successful emergency egress tests at seat pitches as low as 28 inches, and the denial on health grounds asserted that DVT and other ills exist "irrespective of seat pitch." In filing the petition for review of the FAA order, Flyers Rights challenged both denials. Specifically, it noted that although FAA claimed it had sufficient safety emergency egress studies, those studies were "proprietary" and could not be released to the public.

The current Court of Appeals decision grants Flyers Rights' petition for review, but only on the safety issue, not the health issue. Specifically, the Court challenged the FAA refusal to make public the studies demonstrating safe egress. The crux of the Court decision:

"In asserting that decreasing seat size and pitch had no effect on emergency egress, the Administration pointed to certain studies and demonstration tests. But the cited studies say nothing about and do not appear to control for seat pitch, width, or any other seat dimension. Nor do they address or control for how increased passenger size interacts with the current seat dimensions to affect emergency egress. Studies cannot corroborate or demonstrate something that they never mention or even indirectly address."

And , succinctly, "But that is not how judicial review works. We cannot affirm the sufficiency of what we cannot see."

For now, then, the ball is back with the FAA. It's anyone's guess whether FAA will disclose the "proprietary" studies or conduct some new ones, or maybe appeal the decision. So the take-away for consumers is that the door for some relief from tight seating may remain open, but it could be years before you see any actual improvements.

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Consumer advocate Ed Perkins has been writing about travel for more than three decades. The founding editor of the Consumer Reports Travel Letter, he continues to inform travelers and fight consumer abuses every day at SmarterTravel.

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