What's a TRA and how does it differ from a TFR?
As the message says, a TRA has the same rules as an RA, just that it is temporary so it won't appear on charts. There may be expected times when the RA is in use but the actual times will be posted in a NOTAM.


It will be published in the Federal Register ahead of time
Using agency notifies controlling agency when airspace will be "hot"
NOTAMs describe when the airspace will be closed
When the airspace is open, ATC can clear flights (IFR or VFR) through


This is useful if the area is known ahead of time but times may be limited and variable. The using agency must also later submit a report detailing the actual usage of the area.

A TFR defines special flight rules that are applicable in specific circumstances. They are governed by different rules, and a NOTAM is published defining the airspace and times, as well as what restrictions are in effect. A TFR may be defined for the following reasons:


Disaster/hazard areas
Protecting the President, the Vice President, or other public figures
Space flight operations
High barometric pressure
Aerial demonstrations and major sporting events
Security requirements


Each of these categories has general rules for who is allowed to operate in the airspace, though each TFR may include more specific requirements. TFRs issued for disasters/hazards generally require aircraft that are not local flights or directly related to the event to be on an IFR flight plan. Other situations may just require permission from ATC, or effectively make the airspace Class C.