In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to determine if the two sentences clearly agree/disagree with each other, or if this can't be determined. Indicate your answer as yes or no respectively.
Q: Sentence 1: In 1936, Pan American Airways introduced daily passenger air service from San Francisco. Sentence 2: Pan American Airways started service from San Francisco.
A:
yes