The GAPT (http://gapt.iaa.es, www.trappa.es) has a long tradition on the study of the planetary atmospheres by analyzing their IR non-LTE emissions. We have participated in many space missions since the early 90's, as SAMS, ATMOS, ISAMS, and CLAES. More recently we have been Co-Is of the TIMED/SABER of NASA, Vex/VIRTIS, ETGO/NOMAD, and members of the SAG and QWG of Envisat/MIPAS. We are experts in non-LTE radiative transfer, in retrievals of temperature and composition from non-LTE IR emissions, and in the physics and chemistry of the middle and upper regions of planetary atmospheres.