This is mostly done in T-38 jet aircraft out of Ellington Field, due to its proximity to the Johnson Space Center.
ðɪs ɪz mˈoʊstli dˈʌn ɪn tˈiː θˈɜːɾi ˈeɪt dʒˈɛt ˈɛɹkɹæft ˌaʊɾəv ˈɛlɪŋtən fˈiːld, dˈuː tʊ ɪts pɹɑːksˈɪmᵻɾi tə ðə dʒˈɑːnsən spˈeɪs sˈɛntɚ.