Conductors Boustany has worked with include Claudio Abbado, Ivan Fischer, Bramwell Tovey, John Elliot Gardiner, Roger Norrington, Georg Solti, Peter Szilvay, Lubnan Baalbaki, James Judd, Jordi Mora, Volodymyr Sirenko, Levon Parikian, Nicholas Cleobury, Martyn Brabbins, Michel Brandt, Varujan Kodjan, Clark Rundell, Jerzy Maksymiuk, Evelyne Aiello, Ludwig Carrasco, Nader Abbassi, Andrew Morley and Toby Purser.
Boustany has collaborated with several composers on commissions and première performances; composers include: Bushra El-Turk, Houtaf Khoury,[6] Yevhen Stankovych,[7] David Sutton-Anderson, Alun Hoddinott, Tarek Younis, Paul Reade, Peter Cowdrey,[8] Carl Witt, Pierre Thilloy, Paul Renan, Dai Fujikura,[9] Michael Oliva, Beat Furrer, Simon Holt, Boghos Gelalian,[10] Waleed Howrani,[11] Marcel Khalife,[12] and Shaun Bracey.
Boustany has recorded music on labels including Nimbus Alliance, Deutsche Grammophon, and Chandos.
He gives masterclasses worldwide, having launched his In Search of Inspiration[14] summer courses in Minnesota, Brussels, Penzance, France and Greece.
He has also been giving yearly summer masterclasses at the Scottish International Flute Summer School in St Andrews,[15] Scotland, and the Grolloo Sessions[16] with colleague flutists Matthias Ziegler and Ian Clarke, which take place in Grolloo, The Netherlands.