My tracking of nearby ADSB-out aircraft using my local AWACS server.
Being within the KIAH Mode-C ring, all planes are required to have a squawkable transponder for the primary ATC radar.
Unfortunately, most of these planes are invisible without the 1090MHz transponder which allows for a MLAT(multi-lateration)
calculation with multiple base stations. Sometimes an ADSB-IN aircraft is flying nearby which will activate
a ADSB-R (rebroadcast). The traffic within several miles and within 5000' of the aircraft will be rebroadcast meaning
that my AWACS system can now see the ground traffic at major airports as well as random signatures for the remainder of
the transponder only flights.
UAL/UA - United Airlines : 260
SWA/WN - Southwest Airlines : 220
ASH/YV - Mesa Airlines : 184
AAL/AA - American Airlines : 143
UCA/C5 - CommutAir : 116
SKW/OO - SkyWest : 90
DAL/DL - Delta Air Lines : 77
NKS/NK - Spirit Airlines : 59
ENY/MQ - Envoy Air : 52
EJA/1I - NetJets : 37
JBU/B6 - JetBlue Airways : 21
VOI/Y4 - Volaris : 21
UPS/5X - United Parcel Service : 17
FDX/FX - Federal Express : 16
ASA/AS - Alaska Airlines : 13
GTI/5Y - Atlas Air : 13
LXJ/ - Flexjet : 13
AMX/AM - AeroMéxico : 11
FFT/F9 - Frontier Airlines : 11
RPA/RW - Republic Airlines : 11
VIV/VB - Aeroenlaces Nacionales : 9
LET/ - Aerolineas Ejecutivas : 7
SCX/SY - Sun Country Airlines : 7
CJT/W8 - Cargojet Airways : 5
QTR/QR - Qatar Airways : 5
XOJ/ - Xojet : 5
EDV/9E - Endeavor Air : 5
CWG/ - Wing Aviation : 5
SLI/5D - AeroMexico Connect : 4
CLX/CV - Cargolux : 4
EJM/ - Executive Jet Management : 4
ABX/GB - ABX Air : 3
VTM/ - Aeronaves TSM : 3
KLM/KL - KLM Royal Dutch Airlines : 3
DLH/LH - Lufthansa : 3
THY/TK - Turkish Airlines : 3
SKV/RS - Sky Regional Airlines : 3
GAJ/ - Wheels Up - Gama Aviation : 3
JTL/ - Jet Linx Aviation : 3
AAY/G4 - Allegiant Air : 2
AJT/M6 - Amerijet International : 2
ANA/NH - All Nippon Airways : 2
LBQ/ - Quest Diagnostics : 2
SWQ/ - Swift Air (Interstate Equipment Leasing) : 2
JUS/U7 - USA Jet Airlines : 2
XSR/ - Executive AirShare : 2
RDK/ - Memorial Hermann Hospital System : 2
FFL/ - ForeFlight : 2
AMF/A8 - Ameriflight : 1
ACA/AC - Air Canada : 1
ABW/RU - AirBridge Cargo : 1
BAW/BA - British Airways : 1
BVN/ - Baron Aviation Services : 1
CMP/CM - Copa Airlines : 1
UAE/EK - Emirates : 1
DCM/ - FLTPLAN : 1
FLT/B5 - Flightline : 1
IBE/IB - Iberia Airlines : 1
KFS/ - Kalitta Charters : 1
GEC/LH - Lufthansa Cargo : 1
YEL/YE - Yellowtail : 1
FWK/ - Flightworks : 1
SBE/ - World Class Aviation : 1
ASP/SP - Aspen Airways : 1
FWR/ - Flight Aware : 1
CAP/ - Civil Air Patrol : 1
Since it's more expensive to add ADSB-in capability and not required by the FAA many planes don't have this.
Fortunately, using almost the same setup as my home AWACS system Stratux
can supplement your electronic flight bag. I'm currently using Avare
with the external i/o plugin to connect to the
homebuilt stratux.