[jbg_]

I don’t know much about GPS jamming, but I know a fair bit about how airliners navigate. GPS is usually not used for final approach, which is typically either visual or ILS (a radio signal transmitted from the ground). This in contrast to the earlier stages of approach which may use GPS depending on the airport and the specific approach in use. If you can keep the jamming signal contained to the immediate airport vicinity and a few thousand feet above, there should be little or no impact on (non-drone) aircraft navigation.

[panarky]

Truck driver uses a GPS jammer so his boss can't track him, then drives by Newark airport, disrupting their "Smartpath" precision navigation system.

Source: https://www.cnet.com/news/truck-driver-has-gps-jammer-accide...

Smartpath: https://aerospace.honeywell.com/en/products/navigation-and-s...

[cmurf]

There are many more airports that have an RNAV GPS/GNSS approach procedure, than ILS. ILS requires expensive ground equipment, and fairly low obstruction clearance for miles surrounding the airport. I expect RNAV GNSS is used with some frequency at even big airports like Gatwick, on days when conditions don't require ILS in particular when the ILS is out of service for planned maintenance.

Example RNAV GNSS for Gatwick: https://opennav.com/pdf/EGKK/EG_AD_2_EGKK_8-4_en_2010-07-29....