RecruitingPhase 3Drug trialA Study to Evaluate the Efficacy and Safety of Once Daily Treprostinil Palmitil Inhalation Powder (TPIP) in Participants With Pulmonary Arterial Hypertension (PAH)The primary objective of this study is to evaluate the effect of 24-weeks of once daily treatment with TPIP compared with placebo on exercise capacity in adults with PAH.