Background: This study investigated: (1) the effects of the loving-kindness meditation (LKM) on mindfulness, subjective well-being (SWB), and spirituality and (2) the relationships between mindfulness, spirituality, and SWB. Methods: 98 flight attendants from Xiamen Airlines in China were recruited and randomly assigned to the LKM training group (n = 49) or the waiting control group (n = 49)....