For aircraft flying below 29,000 (FL290), the minimum vertical separation is 1,000. Above this, aircraft are typically required to maintain a vertical distance of at least 2,000 ft.
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According to ICAO standards, the minimum vertical separation between aircraft under Instrument Flight Rules (IFR) depends on altitude. For aircraft flying below 29,000 (FL290), the minimum vertical separation is 1,000. Above this, aircraft are typically required to maintain a vertical distance of at least 2,000 ft.
The general guideline on how early to get to the airport for a domestic flight is 2 hours. However, those traveling at a very busy time of year or out of a large airport might want to allow more time.
In aviation, the rule of three or 3:1 rule of descent is a rule of thumb that 3 nautical miles (5.6 km) of travel should be allowed for every 1,000 feet (300 m) of descent. For example, a descent from flight level 350 would require approximately 35x3=105 nautical miles.
b) The requirement for 5/20 is modified and all airlines can commence international operations provided that they deploy 20 aircraft or 20% of total capacity (in term of average number of seats on all departures put together), whichever is higher for domestic operations.