Flight planning10 minute read
Density Altitude Explained, With Worked Examples
What density altitude is, how to compute it from a METAR, worked examples at sea level and at a high mountain airport, and what it does to takeoff and climb.
Flight planning
Routes, fuel, airports and the preflight work that makes a flight uneventful.
Flight planning10 minute read
US Airports by the Numbers: Towers, Fuel and Runways
FlyFren counted every public-use US airport in the FAA's October 2026 NASR data: towers, paved runways, fuel, approaches and how your state compares.
Flight planning8 minute read
VFR Flight Plan vs Flight Following: Do You Need Both?
What a VFR flight plan does and does not do, what flight following gives you, how to get each, how to close a flight plan, and when to use both on one flight.
Flight planning8 minute read
What 69,000 Active NOTAMs Actually Say
FlyFren sorted all 69,011 NOTAMs active on October 3, 2026: what they cover, which keywords dominate, how long they stay open and what it means for a briefing.
Flight planning11 minute read
How to Read NOTAMs Without Missing the One That Matters
Decode a NOTAM field by field: accountability, number, keyword, condition and UTC times, with the common contractions and a routine for sorting a 60-line list.