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:
Pacific_War

Context:
A Japanese force was sent north to attack the Aleutian Islands. The next stage of the plan called for the capture of Midway, which would give him an opportunity to destroy Nimitz's remaining carriers. In May, Allied codebreakers discovered his intentions. Nagumo was again in tactical command but was focused on the invasion of Midway; Yamamoto's complex plan had no provision for intervention by Nimitz before the Japanese expected him. Planned surveillance of the U.S. fleet by long range seaplane did not happen (as a result of an abortive identical operation in March), so Fletcher's carriers were able to proceed to a flanking position without being detected. Nagumo had 272 planes operating from his four carriers, the U.S. 348 (115 land-based).

Question:
How many U.S. planes were land-based?

115