Why they really check carry-on bags—when the overhead bins are empty

Stop lying, American.

Friday, July 10. American #3812, White Plains to Chicago: a 2025 Embraer 175 regional jet. Nine passenger boarding groups.

Only three groups had boarded when the gate agent picked up her microphone. “Ladies and gentlemen, the overhead bins on board are completely full. We’re going to have to gate-check all remaining carry-on bags. Once you land in Chicago, you can retrieve your carry-ons from baggage claim.”

Well, that was odd. Only about 20 people had boarded so far. Another six groups (45 passengers) were waiting to board. How could the overhead bins already be full?

I was in group 4—the first group whose passengers had to gate-check their rolling bags.

But once on the plane, I saw instantly that the gate agent was either mistaken or lying. The bins weren’t even half full. Once I’d passed first class, most of the bins were empty.

As I took my seat, I could hear a lot of grumbling from the passengers around me. We’d have to pick up our small bags from baggage claim in Chicago (not planeside), and that meant a 25-minute wait. By my calculations, that’s about 20 wasted person-hours.

Across the aisle from me, a passenger asked the on-board flight attendant: “Why did we have to check our carry-ons if the bins are empty?” The attendant apologized and said, “Sometimes they just count how many bags they’ve seen go by.”

Well, that didn’t make sense, either. They’d cut off our bags after only 20 people had loaded up. This plane could easily accommodate 50 more bags.

At this point, there was a pause in the boarding process. The aisle was empty. So I grabbed my phone and filmed the empty bins. I thought maybe this eight-second clip might make a good post. Or maybe I’d send it to American to ask what was going on.

I posted my little video on Facebook and on Threads—and jeez, did it strike a nerve. Hundreds of people reported seeing this same routine on flights of their own. One guy mentioned that this “bins are full” lie is a frequent complaint on Reddit.

But there was also a mystifying deluge of hate. People called me “faggot,” “douchebag,” and “fucktard.” They ripped me for insulting the integrity of hard-working gate agents. Weirdest of all, many accused me of making up the story.

(On Threads, one guy theorized that these toxic posts were generated by airline-industry bots. If anyone’s got a better theory, I’d love to hear it.)

Anyway. People quickly began issuing their own confident explanations for the gate agent’s actions, which we shall now consider one by one.

The weight-balance theory

“It’s called weight and balance. The gate agent starts checking bags at a certain number depending on the aircraft,” wrote Collyn Bell and many others.

Interesting theory—but wrong. “We do occasionally move checked baggage from front to rear baggage compartments (or vice-versa),” says Mike T., a veteran commercial airline pilot. (Airline employees are not allowed to speak to the press on the record.) “But we never move onboard carry-on luggage for weight and balance. There’s no way to alter weight-and-balance calculations with carry-ons.”

(Besides: When I flew home the next day, it was the same route, same aircraft, same number of passengers—a full flight. But this time, early and middle groups didn’t have to gate-check their bags.)

The radio theory

A bunch of people asserted that the on-board flight attendant had radioed the gate agent to report that the bins were full. But that’s not it, either. As our on-board flight attendant had pointed out, there is no radio communication with the gate agent, at least not on that American regional jet. (Even if there had been, the flight attendant would not have radioed that the bins were full. Because they weren’t.)

The “big bags” theory

“It’s an RJ [regional jet], dude. Not really meant for big bags,” wrote John Jurik. In other words, the proponents of this theory informed me, the bins are too small to hold standard-sized rolling bags.

I don’t get this argument at all. The agent had already permitted groups 1–3 to put their carry-ons into the bins. So this regional jet somehow could fit those “big bags,” but not ours?

The time-saving theory

According to Delta flight attendant Rebecca P., the point is speed, plain and simple. Gate-checking bags is faster than letting people stow in the overheads, even if there’s room.

“For airlines, especially on shorter turns, an on-time departure is often a higher priority than making sure every carry-on fits in the overhead bins,” she says.

Former baggage specialist Katina R. seconds that argument. “A quick turn gives us less than 25 minutes,” she says. “That includes deplaning and on-boarding. We get no additional time for wheelchairs, infants, families, etc. Checking as many bags as possible expedites the process.”

She also explained why we had to retrieve our bags at baggage claim, rather than planeside. “Easier [for the airline] than bringing them up the jetbridge. All pax [passengers] have to be off the jetbridge prior to boarding the outbound pax, which means you can’t stand there and wait for a bag. Well, you could, but I can’t start boarding until you exit.”

And there we have it: The smoking gun. For the airline, on-time departure is sacrosanct. Delays can cost gate fees, crew time, and passenger reimbursement (if rebooking or hotel stays are required). Even more important, Rebecca adds, “aircraft are scheduled to operate multiple flights throughout the day. So even a small delay on one flight can create a ripple effect across the network.”

It’s faster to throw all carry-ons into the cargo hold than to wait for people to stand in the aisle, fiddling around, Tetrising their overhead bags into the bins. So gate agents have an incentive to err—sometimes wildly—on the side of gate-checking bags.

I’ve written several times to American media relations to ask if they’d confirm or deny that explanation.

Nobody responded.

I did, however, reach someone high up at American who did agree to explain the mystery. I’ll call him Chris.

“On a normal domestic flight, we normally take bags from only the last couple of groups,” he told me. “But if it’s a quick turn—the flight came in late, they have only 30 minutes—they take the bags now. That way, everyone can get in and sit down.”

Well, OK! That makes sense! We can understand that. We can even empathize with that. We all want to leave on time. Mystery solved!

So at this point, there’s only one mystery left: Why lie about the bins being full? Why don’t the gate agents just say that time is the reason for checking the carry-ons?

Chris, for what it’s worth, agrees with me. “If they would explain more, the average customer would understand,” he says. “I’ve had flights where I’ve had to say, ‘The crew’s about to time out. If we can close the doors within the next five minutes, we can salvage this flight.’ And literally everyone stands up within a second, and BOOM—we close the door and go. I’m a firm believer that people want to go where they want to go!”