George, the basic rule of thumb for 146/RJ operations is to use a ‘square’ runway i.e. as long as it is high.
Thus there were operations from Paro (Bhutan) at 7000 ft altitude to Dhaka, thence to Bangkok. Also from Aspen (circa 6000 ft) direct to the US West coast or Chicago.
THY uses their RJ100s at TatVan? (Lake Van, 5000ft, +25C? 24 flap take off) direct to Ankara with a full 100 pax load.
The 146/RJ was built to handle difficult airfields and should match or have better airfield performance than any other RJ, particularly when hot and high. The Avro RJ has the better performance with a higher flat rated thrust engine than the 146.