What is this poem's rhyme scheme in An Irish Airman Foresees His Death in Overcoming?

The rhyme scheme of the poem "An Irish Airman Foresees His Death" by W.B. Yeats is irregular, with some rhymed couplets and alternating rhyme patterns throughout. The lack of a consistent rhyme scheme reflects the speaker's contemplative and introspective tone as he reflects on his impending death.