You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
The_Blitz

Context:
Although night air defence was causing greater concern before the war, it was not at the forefront of RAF planning. Most of the resources went into planning for daylight fighter defences. The difficulty RAF bombers had navigating in darkness, led the British to believe German bombers would suffer the same problems and would be unable to reach and identify their targets. There was also a mentality in all air forces that, if they could carry out effective operations by day, night missions and their disadvantages could be avoided.

Question:
What did the RAF put most of their resources into?

daylight fighter defences