Most community released terrains are tiny, bis made Stratis is tiny 8km where Altis is decent size 30km, so your Jets DLC options are very limited. There are no "flyboys" terrains as good old Bushlurker (RIP, brother) used to call them. But jet pilots don't need to worry because PMC comes to the rescue!
Jets DLC PMC Real World Data Terrains for ArmA 3.
Real world terrain data is: SRTM heightmap, maps.google.com satellite texture and OpenStreetMap.org roads.
This is realistic 1:1 scale terrains for their real life locations, nothing has been scaled down or faked.
If not stated otherwise all terrains are 143km x 143km in size with 71,680 x 71,680 resolution satellite texture which is 2 meters / pixel. There are no (or very few) objects placed! 2020-11-16 note; there are millions of objects in vegetation depending on specific terrain.
Plan is to develop these terrains further, for example populate them with objects (trees, rocks, town/city buildings etc), but no promises.
Releases (not up to date as of 2022-04-27T08:39:00Z, see PMC Tactical Terrains page for latest updates):
PMC Iraq, Al Kut v0.1
PMC Iraq, Baghdad v0.1
PMC Iraq, Basrah v0.1
PMC Iraq, Erbil v0.1 (erbil currently conflicts with afghanistan ghazni and iraq baghdad, so you need to run them separately. this has been fixed for next update).
PMC Iraq, Hillah (40km x 40km) v0.1
PMC Iraq, Karbala (40km x 40km) v0.1
PMC Iraq, Kirkuk v0.1
PMC Iraq, Mosul (81km x 81km) v0.1
PMC Iraq, Najaf (81km x 81km) v0.1
PMC Iraq, Nasiriyah v0.1
PMC Iraq, Ramadi (40km x 40km) v0.1
PMC Iraq, Rutba v0.1
PMC Iraq, Samawah (81km x 81km) v0.1
PMC Iraq, Sulaymaniyah v0.1
PMC Iraq, Tikrit v0.1
PMC Afghanistan, Ghazni v0.1 (ghazni requires CUP Terrains Core because it uses takistani village buildings and vegetation).
PMC Afghanistan, Jalalabad (81km x 81km, 81920 resolution satellite) v0.2
PMC Afghanistan, Kabul v0.1
PMC Afghanistan, Kandahar v0.1
PMC Afghanistan, Kunduz v0.1
PMC Afghanistan, Lashkar Gah v0.1 PMC Afghanistan, Mazari Sharif v0.1 PMC Syria, Al Hasakhah v0.1 PMC Syria, Al Mayadin v0.1 PMC Syria, Aleppo v0.1
PMC Syria, Ar Raqqah v0.1
PMC Syria, Damascus v0.1 PMC Syria, Homs v0.1
PMC Somalia, Baidoa v0.1
PMC Somalia, Kismaayo v0.1 PMC Vietnam, Da Nang v0.1 PMC Vietnam, Dong Hoi v0.1
PMC Vietnam, Hanoi v0.1
PMC Vietnam, Pleiku v0.1 PMC Vietnam, Saigon v0.1
PMC Libya, Ajdabiya v0.1
PMC Libya, Bani Walid (81km x 81km) v0.1
PMC Libya, Bin Jawad v0.1 PMC Libya, Misrata v0.1
PMC Libya, Msallata v0.1
PMC Libya, Nafusa v0.1
PMC Libya, Ras Ajdir v0.1 PMC Libya, Sabha v0.1 PMC Vietnam, Vinh v0.1
PMC Libya, Sirte v0.1
PMC Libya, Tripoli v0.1
PMC Libya, Wazzin (81km x 81km, 81920 resolution satellite) v0.1 PMC Afghanistan, Asadabad (81km x 81km, 81920 resolution satellite) v0.1
PMC Libya, Benghazi (143,360 x 143,360 resolution satellite) v0.1 PMC Ukraine, Donetsk (81km x 81km, 40960 resolution satellite) v0.1
PMC Ukraine, Luhansk (81km x 81km, 40960 resolution satellite) v0.1
PMC Ukraine, Mariupol (81km x 81km, 40960 resolution satellite) v0.1 PMC Pakistan, Abbottabad (81km x 81km, 40960 resolution satellite) v0.1
PMC Balkans, Belgrade v0.1
PMC Balkans, Kosovo v0.1
PMC Balkans, Montenegro v0.1
PMC Balkans, Vojvodina v0.1   Satellite screenshots see PMC Tactical ArmA 3 Terrain page and download from PMC Tactical ArmA 3 Downloads.