> ## Content Index > Fetch the complete content index at: https://www.thecontrail.org/llms.txt > Use this file to discover other available public pages before exploring further. # Washington Has Three Airports. One of Them Is Doing All the Work. - URL: https://www.thecontrail.org/dca-air-safety-act-slots-perimeter-rule/ - Published: 2026-09-15T13:00:48.000Z - Updated: 2026-09-16T11:35:06.000Z - Description: Reagan National was built for 15 million passengers a year. It's handling 25 million. - Author: Zachary Benitez - Tags: News, American Two Virginia senators announced a bill last Thursday that would cut 30 slots at Ronald Reagan Washington National Airport, cap arrivals at 28 an hour, and stop flights bunching up in short windows. Tim Kaine and Mark Warner say they'll introduce the DCA Air Safety Act next week, so it isn't law or even formally before Congress yet. Every piece I've read about it frames this as a safety bill, which it is. In January 2025 a midair collision between an American regional jet and an Army Black Hawk killed 67 people, and the NTSB investigation named airspace congestion and high controller workload among the contributing factors. That's the reason the senators give and it's a real one. But there's a whole second argument buried in this that nobody is writing about, and it has nothing to do with helicopters. ![](https://storage.ghost.io/c/ac/ed/acedfbb2-ff9c-499b-b431-eb36d7539be1/content/images/2026/09/DCA_Nacional_Airport-_Reagan_Nacional_Airport_2-1.jpg) Credit: Kurtkaiser via Wikimedia Commons --- ## The perimeter rule was built to protect two other airports Since 1986, Congress has restricted how many nonstop flights can leave DCA for airports beyond 1,250 miles. That rule wasn't an accident or a quirk. It exists because Dulles and BWI were designed to be the region's growth airports. DCA sits on a small footprint with a short runway in constrained airspace, and it was meant to handle the shorter stuff. Washington was supposed to work as a three-airport system. DCA takes the regional flying, Dulles takes the long haul because its size allows bigger aircraft, and BWI absorbs the rest. Congress has spent decades chipping away at that. Every beyond-perimeter exemption it grants is another transcon flight operating from the wrong airport in the system, and the senators have said plainly that those additions have kept Dulles from realizing its potential as the region's primary long-haul destination. That fight has been close, too. In July 2023 the House defeated an amendment that would have added 14 flights at DCA. Senate Commerce then put ten into a manager's amendment, and those ten survived into the 2024 reauthorization. --- ## The number that should be in every version of this story One figure turned up in a letter these same senators sent to the Commerce and Transportation committees in March 2024, and I haven't seen it anywhere in the coverage of this bill. Adding flights at DCA, they wrote, threatens current service reliability to **92 other inside-perimeter airports** across the country. They attached a list of them. Reagan National · slots and the perimeter ### Who the 1,250-mile rule was written for Congress has restricted nonstops beyond 1,250 miles from DCA since 1986. 92 **Airports inside the perimeter**Their service reliability to Washington runs through DCA. Beyond-perimeter flights use larger aircraft, and larger aircraft need wider separation standards, which slows the cadence of takeoffs and landings for every route using the airport. Designed to serve 15M passengers a year On pace for, 2024 25M ten million over design capacity Flights delayed 20–22% averaging 67 minutes, per the senators' 2024 letter The three-airport system as designed DCA **Short-haul**Small footprint, short runway, constrained airspace. Built for regional flying IAD **Long-haul**Dulles was designated a growth airport, with room for larger aircraft BWI **Overflow and growth**Planned alongside Dulles to absorb the region's expansion Today Arrival rate of 30 aircraft an hour No cap on clustering within the hour Beyond-perimeter exemptions granted repeatedly by Congress 2024 FAA Reauthorization added five slots, meaning ten flights Under the bill Arrival rate capped at 28 per consecutive 60 minutes Binding 30-minute interval caps within 180 days 30 slots removed over five years, at least 26 beyond-perimeter Reports to Congress, public comment and expert input required The DCA Air Safety Act was announced on September 11 by Senators Tim Kaine and Mark Warner, who said they would introduce it the following week. The 92-airport figure, the design capacity and the delay statistics come from a March 2024 letter the Virginia and Maryland senators sent to the Senate Commerce and House Transportation & Infrastructure committees, which included an appendix naming the airports. contrail.travel Ninety-two. Those are the small and mid-size cities whose Washington connection runs through DCA, and I had assumed the harm to them was commercial. A transcon flight earns more per slot than a service to a small city, so the small city loses out. That reasoning turns out to be wrong, and the real explanation is more specific. Beyond-perimeter flights use bigger aircraft. Kaine and Warner put the difference at roughly 70 additional passengers per flight, and bigger aircraft need wider separation standards, which slows the cadence of takeoffs and landings across the whole airport. So a transcontinental flight doesn't just occupy a slot. It reduces how many aircraft the runway can process per hour, which produces delays and cancellations that land on every route using DCA. The same problem shows up on the landside. Those extra passengers strain roadways, parking and baggage systems that were sized for a smaller airport. So when Congress adds ten beyond-perimeter flights, the cost doesn't fall on the airport in some abstract way. It falls on a city somewhere inside the perimeter that quietly loses reliability, and has no senator making speeches about it because the effect is spread across ninety-two places at once. That's the part of this bill I find genuinely interesting. Of the 30 slots it would cut, at least 26 come from beyond-perimeter exemptions. Read that as a safety measure if you like. It's also a deliberate attempt to undo four decades of Congress redirecting DCA's capacity toward long-haul routes it was never designed to serve. --- ## DCA was built for 15 million passengers That same 2024 letter is worth reading in full, because it puts numbers on overcrowding that most coverage describes in adjectives. DCA was designed to accommodate 15 million passengers a year. In 2024 it was on pace to serve 25 million, which the senators attribute partly to previous congressional carve-outs to the slot and perimeter rules. They also cite a 2022 report putting DCA's cancellation rate third worst among the country's busiest airports, and say that 20 to 22 percent of flights into and out of the airport were experiencing delays averaging 67 minutes. On the landside, during one holiday weekend in 2022, more than 800 customers were turned away because the parking garages were full. Ten million a year over design capacity. I wrote about Newark Terminal B last week, a building handling roughly 11.5 million against a 6.8 million design, and thought that was the starkest example I'd come across. This is a bigger gap in absolute terms at an airport with one runway doing the heavy lifting. --- ## What the bill actually does Four things, and the mechanics matter. First, the Airport Arrival Rate gets capped at no more than 28 aircraft during any consecutive 60-minute period, down from 30. That figure has been moving. Before the January 2025 collision, DCA allowed 36 arrivals an hour. The FAA cut it to 26 afterward and later restored it to 30\. This bill would settle it at 28, which is lower than today and still well above the post-accident restriction. Reagan National · arrivals per hour ### The rate has moved three times in two years How many aircraft the FAA allows to land at DCA in a 60-minute period. Before Jan 2025Pre-collision 36 After Jan 2025FAA restriction 26 TodayRestored by the FAA 30 Under the billProposed cap 28 Bars scaled to the 36 figure What the hourly cap doesn't fix Clustering, where airlines compress departures and arrivals into short high-intensity windows inside the hour The bill would give the FAA 180 days to set binding 30-minute interval caps, forcing operations to spread across the hour Airlines create clustering through scheduling, so an hourly number alone leaves it untouched The January 2025 midair collision between an American regional jet and a US Army Black Hawk killed 67 people. The NTSB investigation identified airspace congestion and high controller workload among the contributing factors. The proposed cap is 28 aircraft during any consecutive 60-minute period. contrail.travel Second, it attacks clustering, which is when departures and arrivals get compressed into short high-intensity windows. The FAA would have 180 days to establish binding 30-minute interval caps so operations spread evenly across the hour. That's the provision I'd watch most closely, because clustering is an operational reality airlines create through scheduling rather than something the hourly cap addresses on its own. Third, it eliminates 30 slots over five years, at least 26 of them beyond-perimeter exemptions. Fourth, it mandates reports to Congress, a public comment process and expert input on implementation. Slot decisions usually happen quietly, so that's a meaningful change on its own. --- ## Who loses flights Fewer western nonstops from DCA, if it passes as written. American operates a hub there and would face the most schedule reshuffling. Passengers heading to the west coast would lean more on Dulles and BWI, which is exactly what the perimeter rule intended in the first place. I'd point out the obvious thing about my own read here, which is that this is also convenient. Virginia's senators have opposed slot and perimeter changes for years, and this bill lets them pursue a long-held network position through a safety argument nobody can easily dispute. Both things can be true at once. Congestion in that airspace is real, and the people saying so also wanted these flights gone before anyone died. --- ## What happens next Nothing quickly. Nothing has been introduced yet, it needs a vote, and the slot eliminations would phase in over five years even if it passes. What I'll be watching is whether any senator from outside the region signs on. Congressional support for adding DCA slots has historically come from members who want a shorter commute home, and reversing that means asking people to vote against their own convenience. If this bill gets cosponsors from beyond the perimeter, it's serious. If it stays a Virginia and Maryland project, it's a statement.