So if you're flying along enroute (IFR) and are then advised that the airspace you are in is shortly becoming TIBA. Do you then get a reduced cost of the airspace if you remain in TIBA or a you still paying full price.
On several occassions we (the crew) have elected to climb to remain outside TIBA. Purely a safety consideration though.
TIBA = Traffic Incidents Barely Avoided
