Astronauts-in-training (astronaut candidates) may also experience short periods of weightlessness (microgravity) in an aircraft called the "Vomit Comet," the nickname given to a pair of modified KC-135s (retired in 2000 and 2004, respectively, and replaced in 2005 with a C-9) which perform parabolic flights.
ˈæstɹənˌɔːtsɪntɹˈeɪnɪŋ ˈæstɹənˌɔːt kˈændᵻdˌeɪts mˈeɪ ˈɔːlsoʊ ɛkspˈiəɹɪəns ʃˈɔːɹt pˈiəɹɪədz ʌv wˈeɪtləsnəs mˌaɪkɹoʊɡɹˈævᵻɾi ɪn ɐn ˈɛɹkɹæft kˈɔːld ðə "vˈɑːmɪt kˈɑːmɪt," ðə nˈɪkneɪm ɡˈɪvən tʊ ɐ pˈɛɹ ʌv mˈɑːdᵻfˌaɪd kˌeɪsˈiː wˈʌnhˈʌndɹɪd θˈɜːɾi fˈaɪv z ɹᵻtˈaɪɚd ɪn tˈuː θˈaʊzənd ænd tˈuː θˈaʊzənd fˈoːɹ, ɹᵻspˈɛktɪvli, ænd ɹᵻplˈeɪst ɪn tˈuː θˈaʊzənd fˈaɪv wɪð ɐ sˈiː nˈaɪn wˌɪtʃ pɚfˈɔːɹm pˌæɹəbˈɑːlɪk flˈaɪts.