Is it permissible to delay travel to catch the 'Jam' at-Taqdim' prayer, or is that considered a trick?

It is permissible for the traveler to combine prayers by performing the earlier prayer (jam' taqdim) if the time for the first prayer has begun. It is also legislated for him to shorten prayers (qasr) from his departure until his return. It is preferable not to combine prayers unless there is a need, but if he does combine them, there is no harm, because combining is a concession for the traveler. However, it is less preferred if he expects to reach his hometown before or during the time of the second prayer.