CloudSat
CloudSat flies in formation in the "A Train" , with several other satellites including Aqua , Aura , and CALIPSO . 
<triplet> A Train <subj> Aqua <obj> has part <subj> Aura <obj> has part <triplet> Aqua <subj> A Train <obj> part of <triplet> Aura <subj> A Train <obj> part of