Airplane Mode

Do I really need to use Airplane Mode on my iPad or iPhone?

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3 min read

One of the most common questions we hear as pilots is, “Do I really need to put my phone in Airplane Mode?” The airlines have been saying yes for years, but many travelers think this advice is outdated and it’s safe to ignore. Is that true in a small airplane? And what is Airplane Mode anyway? Here’s our advice.

Airplane mode

Does it really matter?

Let’s begin with the actual rules. First there’s FAR 91.21, which covers all portable electronic devices—not just cell phones—being used on any aircraft operating under an air carrier certificate (think airlines) or under IFR. No portable electronic devices can be used in these cases unless “the operator of the aircraft has determined it will not cause interference with the navigation or communication system.” This is a fairly simple determination for a GA pilot to make in the airplane, and the FAA has been clear that sophisticated testing equipment is not required to satisfy this FAR.

There’s also AC 91.21-1D, which expands on FAR 91.21. This AC offers suggestions for evaluating portable electronic devices and clarifies that cell phones and LTE-enabled iPads, while prohibited from use in flight by FCC regulations, are allowed to be used in aircraft while on the ground for picking up a clearance or filing a flight plan.

Neither of these FAA documents explicitly ban the use of cell phones or celluar-enabled iPads, but the FCC does in 22.925: “When any aircraft leaves the ground, all cellular telephones on board that aircraft must be turned off.” More practically, it’s clear the main concern from regulators is electromagnetic interference (EMI), and in our experience we’ve almost never seen any interference from an operating cell phone. However, it’s worth pointing out that the chance of interference isn’t zero—hold your iPhone up to the compass and see what happens.

However, even if there’s no EMI there are good reasons why you should consider using Airplane Mode.

First, consider why the FCC bans the use of cellular devices—it’s really about the cell towers on the ground, not the airplane instruments. Airborne cellular transmitters have line of sight to many more towers than a typical phone on the ground, which means your iPhone at 2500 feet can easily swamp channels on multiple towers. This isn’t good for the performance of the rest of the cell network and for everyone on the ground. Some people even think carriers temporarily blacklist phones that connect to lots of towers. If you’ve ever tried to get your emails while your airline flight was on approach but found performance to be really bad, that might be what’s going on.

Secondly, Airplane Mode is much more efficient for your phone or iPad battery. This is mostly because your devices won’t be using extra power to search for cell towers or trying to coordinate connections with towers that are barely reachable. Leaving LTE on for the entire flight can easily consume half your battery life on a two-hour flight.

Lastly, Airplane Mode should make your apps perform better. Instead of trying to make network requests that will most likely time out when you barely have any bandwidth, network requests won’t happen at all, and your apps should just fall back to being offline. Anecdotally, we’ve also seen more reliable performance with external devices like ADS-B receivers when cellular data is turned off.

Does that mean you should never use your cell phone in flight? No. In a worst-case scenario, like a total communications failure in flight, we wouldn’t hesitate to try calling ATC on the phone. It has happened, and it has worked. You might have to beg forgiveness with the FCC, but that’s a small price to pay.

One last note: remember that Airplane Mode does NOT disable the internal GPS (if your iPad has one). Many years ago that was the case, but no longer. You can turn Airplane Mode on and still navigate in ForeFlight.

13 replies
  1. tawood
    tawood says:

    This law was passed back when an airborne cell phone could wreak havoc on the cellular system…but now (and for the past multiple decades), the cellular system is designed to deal with a phone that hits too many towers, along with directional antennas that make it pretty much impossible to use a cell phone at too high an altitude. So…put your phones in airplane mode if you wish, but while you’re at it, don’t make faces at a dog in Ohio, don’t sing in your swimsuit in Florida, and don’t let a donkey sleep in a bathtub in Arizona…these are all laws (for real), and all are as necessary to obey as the FCCs 22.925.

  2. Dan
    Dan says:

    Could you please provide reference for the comment “FAR91.21 … the FAA has been clear that sophisticated testing equipment is not required to satisfy this FAR.”? Thanks

  3. James Baxter
    James Baxter says:

    The airplane as one insurane ompany told me. the speed of the plane can have a problem with the ins company as speed has to do with it.

    • Joe Pilot
      Joe Pilot says:

      I think most people ignore what you wrote as it is virtually impossible to understand. Maybe try again with better sentence structure, grammar, etc??

  4. Bill
    Bill says:

    The last I recall reading, the Civil Air Patrol frequently uses Cell Phone data for finding downed aircraft. It would seem obvious that both the cell phone must be on and there be cell service for this work. What percentage, I don’t recall how much. I will look and see if I can find the article.

    • PeteMc
      PeteMc says:

      Odds are the Cell Data is collected by the Carrier (e.g. Verizon, AT&T, etc.) and then a general area is given to the CAP as an initial search area. It is also possible they have a mini version of a COW and look for the ESN, but I hadn’t heard of that. (Might be pricey for CAP to have too.)

    MIKE TURNER says:

    JOHN, The last question by Mr. Pierce is extremely important, and your answer is partially correct. On both my iPhone and iPad , the selection of Airplane mode ON , AUTOMATICALLY turns off the WIFI, which is required for our Stratus use. The answer to ” leave the WIFI on “, was a little misleading, as with it turned OFF by the Airplane Mode ON, the WIFI must be purposely turned ON, AFTER the airplane mode is selected. This all makes sense now, and I will choose these functions in the future. I have to date been using the airplane mode OFF, and haven’t been concerned about the power drain, as we installed the Stratus power plug several years ago, that keeps the iPad, foreflight, and Stratus fully charged the entire flight. Thanks for this insight towards better use of foreflight.

  6. Jack Morris
    Jack Morris says:

    John Z:

    My iPad only has WiFi and Blue Tooth. It does not have hardware to support cellular communications. The Settings panel does have an Airplane Mode on-off “switch.” So what are the correct settings for my iPad when airborne?

    • John Zimmerman
      John Zimmerman says:

      Even non-cellular iPads have Airplane Mode as an option (I have one right here with me and it’s showing up). You might check to see what version of iOS you are running. Airplane Mode should be one of the first options in the main Settings app.

      So ideally you would go to Settings -> Airplane Mode: ON -> WiFi -> On

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