
Flight delays are a common issue that travellers face, and some airports are more notorious for this issue than others. There are many reasons for flight delays, including staffing shortages, increased air traffic, unpredictable weather, tech glitches, and infrastructure upgrades. According to various sources, some of the most delayed airports in the US include San Francisco International Airport (SFO), Newark Airport, Boston Logan International Airport, Austin-Bergstrom International Airport, Miami International Airport, Orlando International Airport, and San Diego International Airport. These airports face delays due to factors such as congested airspace, runway layout, and high traffic volume.
| Characteristics | Values |
|---|---|
| Airports with huge TSA delays | SFO, Newark Airport, Boston Logan, Austin-Bergstrom, Miami International, MCO, San Diego |
| Causes of delays | Staffing shortages, increased air traffic, unpredictable weather, tech glitches, infrastructure upgrades, National Aviation System issues, runway layout |
| Tips to navigate travel delays | Plan for delays, stay updated with real-time updates on flight statuses |
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What You'll Learn

Staffing shortages
The TSA anticipated a “significant surge” in summer travel and took several measures to address the staffing shortages. These included allowing part-time employees to transition to full-time roles, increasing overtime, adjusting shifts, and offering $1,000 recruitment incentives for new employees accepting transportation security officer positions. The TSA also requested that office workers volunteer to assist with non-screening tasks at airport checkpoints.
Despite these efforts, the TSA faced challenges in attracting enough job applicants. The administration aimed to hire 6,000 new workers nationwide, but only half of those positions had been filled. As a result, travelers could expect longer wait times at airports, with around one-third of the nation's airports projected to be impacted by staffing shortages.
The staffing shortages at TSA checkpoints are part of a broader trend of worker shortages across various industries in the United States as states navigate the aftermath of the COVID-19 pandemic. As travel restrictions eased and air travel rebounded, the TSA struggled to keep pace with the increasing passenger volume. This mismatch between rising traveler numbers and insufficient screening workforce availability contributed to the delays and longer wait times experienced at many airports.
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National Aviation System issues
National Aviation System (NAS) issues were the top cause of delays at Boston Logan and Newark Airport in 2024. NAS is a broad set of disruptions that include airport operations, heavy traffic volume, and air traffic control.
NAS issues are not a new phenomenon. In 2000, flight delays totaled 1.4 million, and one in four flights were delayed. Since then, the aviation system has been impacted by several unanticipated events, such as the September 11 terrorist attacks, the Iraq War, and the SARS outbreak, which significantly reduced demand for air travel.
While initiatives by the FAA, airlines, and airports might help reduce flight delays and increase capacity in the short term, developing long-term solutions for enhancing capacity and reducing delays at the most delay-prone airports remains a challenge.
Some options to address capacity and delay issues include developing alternative modes of intercity travel, such as high-speed rail, and constructing fast-rail services in populated metropolitan areas. However, these options may conflict with the interests of stakeholders and be costly to implement.
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Unpredictable weather
Weather-related delays are often due to a combination of system-impacting weather and excess demand. For example, in July 2019, a cold front moved over the New York metropolitan area, causing thunderstorms and shower activity. This resulted in aircraft being rerouted, delayed, or diverted to alternate airports. New York City's airports, including John F. Kennedy International Airport, Newark, and LaGuardia, are particularly susceptible to weather-related delays due to their busy airspace and high volume of European travel. JFK airport, for instance, experiences an average of almost 10,000 weather-related delays annually, with snowstorms and frontal systems accompanied by low clouds causing the most disruptions.
Similarly, Denver International Airport faces challenges due to snow and wind. Colorado Front Range snowstorms can occur from September to May, and strong crosswinds can force arriving planes to use alternate runways or even remain at their origin airport. Boston Logan International Airport also experiences winter weather delays, with a 50% chance of significant snowfall each season.
Houston's proximity to the Gulf of Mexico makes it prone to fog, tropical storms, and hurricanes. Slow-moving thunderstorms in the summer can cause delays of over an hour. Additionally, Dallas/Fort Worth International Airport (DFW) in Texas is susceptible to delays due to slow-moving thunderstorms and rare snow and ice events.
To mitigate the impact of unpredictable weather, strategic planning, such as severe weather avoidance plans and ground delay programs, can be implemented to relocate demand and temporarily hold aircraft at departure airports, respectively.
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Runway layout
While there are many factors that cause flight delays, runway configuration and layout can play a crucial role in on-time performance. A study by Rachel J. Kennedy at Purdue University investigated the impact of runway configuration on arrival delays. The study reviewed four types of runway configurations:
- Single runways: These consist of one long runway used for both takeoffs and landings. Single runways are common in small regional airports and can handle up to 100 inbound and outbound flights per hour.
- Crossing runways: This configuration involves two or more runways that cross paths and are used in areas with strong winds and limited expansion space. The advantage is that at least one runway can be operated independently of the wind direction.
- Double runways: One runway is located close to the terminal, reducing taxi times, while the other is farther away and used for takeoffs only. This setup improves traffic flow and airport performance.
- Parallel runways: When parallel runways are too close together, such as at SFO airport, low visibility can mandate the use of only one runway, reducing traffic capacity and causing delays.
While Kennedy's study focused on a military airport and did not find conclusive evidence that runway configuration directly improves on-time performance, it did highlight the complexity of optimizing runway layouts to minimize delays. Factors such as traffic volume, taxi times, and peak hours also influence delays, and a well-designed runway system can help manage these variables. Ultimately, the capacity and efficiency of a runway system are critical to reducing delays and their associated costs.
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Congestion and air traffic
Air traffic congestion is a significant issue that impacts both passengers and the aviation industry. It occurs when there is a high volume of aircraft operating in a specific airspace or airport, leading to delays and disruptions. Several factors contribute to air traffic congestion, including aircraft weight classes, speed differences, and airport infrastructure limitations.
Aircraft weight classes play a crucial role in air traffic congestion. Heavier jets require a greater radar separation distance, both during arrival and departure. This means that following aircraft must maintain a distance of 4, 5, or 6 nautical miles, depending on the weight class of the preceding heavy jet. As a result, the airport's actual arrival and departure capacity decreases, leading to increased congestion and delays.
Speed differences between aircraft also contribute to congestion. The varying speeds affect air traffic control processing, as faster aircraft may catch up to slower ones, requiring air traffic controllers to adjust trajectories and maintain safe distances. Additionally, airports with limited runway capacity, such as San Diego International Airport, are more prone to delays when traffic volume is high.
The cost of air traffic delays can be significant. According to a 1986 report by the Transportation Systems Center, the estimated annual cost of air traffic delay in 1984 was approximately $4.65 billion. This includes the value of passenger time lost, estimated at $22.3 million, and the direct cost to aircraft, amounting to $2.63 billion.
To address air traffic congestion and delays, improvements in air traffic control systems and airport infrastructure are necessary. However, implementing advanced technologies and constructing new airports or expanding existing ones are often slow and controversial processes involving multiple stakeholders and federal funding.
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Frequently asked questions
SFO is the most delayed US airport, with its runway layout impacting operations.
Low visibility, which occurs frequently in the Bay Area, means that only one runway can be used, reducing the number of flights accommodated.
Newark Airport in New Jersey is in the top 10 most delayed airports, with National Aviation System issues causing hold-ups.
Orlando's MCO airport, the ninth-busiest in the US, had more than a quarter of flights arriving late in 2024. Miami International Airport also has frequent delays.
Staffing shortages, increased air traffic, unpredictable weather, tech issues, and infrastructure upgrades can all cause TSA delays.



































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