This research follows a previously published paper presented by Pourtoulidou and Frey which describes the conversion of a classroom-based to blended training for new employees entering aerospace companies [1]. This paper presents the lessons learned that derived from the analysis of the results after evaluating the blended training according to the participants’, subject matter experts’, and trainer’s perspectives. Prior to the training, Pourtoulidou and Frey analyzed the demands of aerospace companies and the labor market in order to develop this introductory training [1]. The classroom-based training was developed, implemented and evaluated in 2018/2019. Utilizing this evaluation, the blended training consisted of an online phase, which lasted six months and provided access to lecture videos, literature material, quizzes, forums and virtual meetings over the Moodle platform. In the middle of the online phase, a face-to-face session took place in October 2021 in which the participants worked with practical applications and associated with subject matter experts operating directly in industrial projects. The lessons learned focus on the training development for employees’ blended courses and on the specific limitations resulting from developing a joint training for entry-level aerospace engineers. The flexibility and further benefits of the training’s online phase were well received from the participants, while the opportunity to meet, work and exchange experiences in person during the training was highly appreciated. The impact of COVID-19 on participants’ experience and feedback was also visible and commented on.