I haven't looked through your code so I don't know if it completely solves your problem, especially with the requirements of adding airplanes with the same id onto the same line. join - join two files according to a common key is based on the idea of loading one file completely into memory and using a hash to find the corresponding airplane id.

In reply to Re: concatenation of lines from two different files by Corion
in thread concatenation of lines from two different files by steph_bow

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