Automated passport control kiosks can recognize faces, measure height and take fingerprints but apparently they can only dramatically reduce average wait times at some of the U.S. airports using them.

Automated passport control first rolled out for international travelers at Chicago’s O’Hare Airport in July 2013 and since then 23 other U.S. airports implemented the kiosks in their U.S. Customs and Border Protection international arrivals areas. When the kiosks debuted in Chicago and a few months later at New York’s JFK Airport, U.S. officials asserted they would slash average wait times by as much as 40%. They’ve appeared to deliver on that promise at some airports while most have seen mediocre success.

At JFK airport the average wait time for international travelers to complete the two-step arrivals process, using the kiosks and then showing the receipt travelers receive to a Customs Officer, is about 18.5 minutes so far this month based on Customs data. That’s a 65.9% decrease from the 30.7-minute average wait time in March 2013 before the kiosks launched at JFK and this puts JFK at the top of the leaderboard in terms of which airport can claim the most success from the kiosks.

However, the improved overall monthly average wait time doesn’t mean JFK completely overcame its notoriously long Customs wait times.

For example, Delta Air Lines boasted that Customs wait times in its Terminal 4 arrivals facility at JFK were reduced by 90% shortly after the kiosks became available in October 2013 but last week there were still several instances of maximum wait times exceeding two hours in Terminal 4 and average wait times hovered around one hour.

Only four of the 24 airports using the kiosks managed to reduce their average wait time this month by 40% or more compared with March 2013 or 2014 (whichever date came before kiosks were implemented). After JFK, Dallas/Forth Worth International Airport, Houston George Bush Intercontinental Airport and Miami International Airport reduced their average wait times by 51.6%, 45.9% and 40.4%, respectively, for this month compared to either March 2013 or 2014 (see chart below for comparisons).

In March 2015, Miami International Airport’s North Terminal had the highest average wait time (22.1 minutes) among 24 airports and also had the highest average wait time in March 2013 before its kiosks arrived (37.1 minutes). Phoenix Sky Harbor International Airport’s Terminal 4 had the shortest average wait time so far this month (7.9 minutes).

The average wait times at some airports weren’t terrible to begin with before kiosks arrived which could explain why some terminals saw small percentage decreases, but still included excessive wait times of an hour or more in most cases. Some of the airports, such as JFK, Orlando International Airport and Chicago O’Hare Airport, allow travelers from the 38 visa waiver countries to use the kiosks while many, including Phoenix Sky Harbor and Seattle-Tacoma airports., only grant access to U.S. and Canadian citizens.

It’s a given that all of the these airports have varying amounts of international arrivals each year and it’s unfair to expect average wait times at airports with 20 million annual international arrivals to mirror those at airports with only a few million, for example. Still, airports are aware of their needs and realize that they’ll need more kiosks and personnel on hand if they want to make serious dents in their wait times.

We combed through Customs’ airport wait times data for March 2015 and calculated the overall average wait time for the month based on the average wait time for each day. We also compared this number to either March 2013 or 2014 (depending on which month came before kiosks were implemented) to compare how wait times have changed.

The results are below:

Ranking of U.S. Airports With Largest Percent Decreases in Overall Average Wait Time From Using Automated Passport Control Kiosks for March 2015 Compared to Either March 2013 or March 2014

RankAirport/TerminalAvg. Wait Time March 2013 (Minutes)Avg. Wait Time March 2014 (Minutes)Avg. Wait Time March 2015 (Minutes)% DecreaseMonth Kiosks Were Implemented
1New York JFK Airport30.718.565.90%Implemented October 2013
2Dallas/Forth Worth Airport Terminal D23.611.451.60%Implemented January 2014
3Houston George Bush Intercontinental Airport Terminal IAB26.114.145.90%Implemented January 2014
4Miami International Airport North Terminal37.122.140.40%Implemented November 2013
5Chicago Midway Airport Main Terminal12.77.739.30%Implemented March 2014
6Chicago O’Hare Airport Terminal 521.413.636.40%Implemented July 2013
7Tampa International Airport Airside F Terminal16.310.436.20%Implemented August 2014
8Los Angeles International Airport Terminal 524.116.0433.40%Implemented June 2014
9Charlotte Douglas Airport Main Terminal12.78.533.07%Implemented May 2014
10Minneapolis-Saint Paul International Airport Terminal 116.911.531.90%Implemented October 2014
11Austin-Bergstrom International Airport Main Terminal18.712.931.02%Implemented March 2015
12Orlando International Airport Airside, Airside 4 Terminals24.317.0329.90%Implemented February 2014
13Los Angeles International Airport Tom Bradley Terminal20.214.627.70%Implemented September 2014
14Boston Logan International Airport Terminal E19.214.524.40%Implemented July 2014
15Washington Dulles Airport Terminal A12.19.223.90%Implemented October 2014
16Atlanta Hartsfield-Jackson Airport Concourse E, Concourse F11.79.122.20%Implemented May 2014
17San Diego International Airport Terminal 212.59.920.80%Implemented January 2015
18Seattle-Tacoma Airport South Satellite Terminal10.89.0716.02%Implemented January 2014
19Phoenix Sky Harbor Airport Terminal 49.37.915.05%Implemented July 2014
20Newark Liberty Airport Terminal C14.112.79.90%Implemented June 2014
21Fort Lauderdale-Hollywood Airport Terminal 422.120.38.10%Implemented March 2014
22Denver International Airport Concourse A11.610.86.90%Implemented October 2014
23Detroit Metro Airport McNamara Terminal14.0413.076.91%Implemented July 2014
24Philadelphia International Airport Terminal A13.412.56.70%Implemented October 2014

Source: U.S. Customs and Border Protection data

Photo Credit: Automated passport control kiosks at Chicago O'Hare Airport in 2013. Kristoffer Grogan / U.S. Customs and Border Protection