JAMMING- Denotes emissions that do not mimic Global Navigation Satellite System (GNSS) signals (e.g., GPS and WAAS), but rather interfere with the civil receiver's ability to acquire and track GNSS signals. Jamming can result in denial of GNSS navigation, positioning, timing and aircraft dependent functions.
JET ROUTE- A route designed to serve aircraft operations from 18,000 feet MSL up to and including flight level 450. The routes are referred to as “J” routes with numbering to identify the designated route; e.g., J105.
(Refer to 14 CFR Part 71.)
JETTISONING OF EXTERNAL STORES- Airborne release of external stores; e.g., tiptanks, ordnance.
(Refer to 14 CFR Part 91.)