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 : 670
SWA/WN - Southwest Airlines : 443
AAL/AA - American Airlines : 191
ASH/YV - Mesa Airlines : 178
UCA/C5 - CommutAir : 143
DAL/DL - Delta Air Lines : 129
SKW/OO - SkyWest : 126
NKS/NK - Spirit Airlines : 80
FFT/F9 - Frontier Airlines : 49
EJA/1I - NetJets : 39
AMX/AM - AeroMéxico : 31
FDX/FX - Federal Express : 26
ENY/MQ - Envoy Air : 24
UPS/5X - United Parcel Service : 23
VOI/Y4 - Volaris : 21
VIV/VB - Aeroenlaces Nacionales : 19
JBU/B6 - JetBlue Airways : 18
ASA/AS - Alaska Airlines : 16
SLI/5D - AeroMexico Connect : 15
ACA/AC - Air Canada : 15
ATN/8C - Air Transport International : 15
SCX/SY - Sun Country Airlines : 14
LXJ/ - Flexjet : 13
AAY/G4 - Allegiant Air : 10
WJA/WS - WestJet : 8
TAI/TA - Taca International Airlines : 8
VTM/ - Aeronaves TSM : 6
SCM/ - American Jet International : 6
BAW/BA - British Airways : 6
CJT/W8 - Cargojet Airways : 6
JSX/XE - JSX : 6
GTI/5Y - Atlas Air : 5
THY/TK - Turkish Airlines : 5
CYO/ - Air Transport : 4
HAL/HA - Hawaiian Airlines : 4
DLH/LH - Lufthansa : 4
YEL/YE - Yellowtail : 4
ABX/GB - ABX Air : 3
AFR/AF - Air France : 3
CMP/CM - Copa Airlines : 3
KLM/KL - KLM Royal Dutch Airlines : 3
JIA/OH - PSA Airlines : 3
XSR/ - Executive AirShare : 3
EDV/9E - Endeavor Air : 3
CAP/ - Civil Air Patrol : 3
AMF/A8 - Ameriflight : 2
ANA/NH - All Nippon Airways : 2
ANZ/NZ - Air New Zealand : 2
CLX/CV - Cargolux : 2
CPA/CX - Cathay Pacific : 2
EVA/BR - EVA Air : 2
UAE/EK - Emirates : 2
IBE/IB - Iberia Airlines : 2
GEC/LH - Lufthansa Cargo : 2
QTR/QR - Qatar Airways : 2
JUS/U7 - USA Jet Airlines : 2
CNS/ - Cobalt Air : 2
NGF/ - Angel Flight America : 1
RCH/MC - Air Mobility Command : 1
HER/UD - Hex'Air : 1
SCW/ - Malmo Aviation : 1
SCW/TF - Malmö Aviation : 1
PAT/ - Department of the Army, Priority Air Transport : 1
LBQ/ - Quest Diagnostics : 1
RPA/RW - Republic Airlines : 1
RAX/ - Royal Air Freight : 1
FWK/ - Flightworks : 1
JAS/ - Jet Aviation Flight Services : 1
JTL/ - Jet Linx Aviation : 1
CNV/ - US Navy Air Logistics Office : 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.