FAA aircraft equipment suffixes changed towards the end of October. The information in the link above from flightaware is no longer accurate.
The only information I could find with 2 minutes of googling came from the NBAA.
Here is an excerpt.
"Las Vegas, NV
, Oct. 23, 2013 – The FAA today is updating the equipment suffixes for domestic flight plans to more accurately indicate the global navigation satellite system (GNSS) capabilities of aircraft. Effective Thursday, Oct. 24 at 0001Z, the closing day of the National Business Aviation Association (NBAA) Business Aviation Convention & Exhibition (NBAA2013), the /R, /Q, /E, /F, /J and /K suffixes will be removed and replaced with new suffixes, according to the aircraft’s equipage for RNAV capability, GNSS capability and RVSM approval.
When filing a domestic flight plan, operators that have been using the removed suffixes should determine the new equipment suffix for their aircraft as follows:
• RNAV capability with GNSS and with RVSM: /L
• RNAV capability with GNSS and without RVSM: /G
• RNAV capability without GNSS and with RVSM: /Z
• RNAV capability without GNSS and without RVSM: /I
Operators should only use the new suffixes when they have RNAV capability, but do not require performance-based navigation (PBN) routing (for example RNAV SIDs and STARs). Operators that desire PBN routing should file an International Civil Aviation Organization format flight plan including PBN information in Field 18 per instructions."
Two rules in aviation, don't hit anything and don't run out of gas, cause if you run out of gas yer gonna hit something.