((™𝕊T𝔼P~by~𝕊T𝔼P™))what is the cheapest day to book a flight on United airlines?

((™𝕊T𝔼P~by~𝕊T𝔼P™))what is the cheapest day to book a flight on United airlines?((™𝕊T𝔼P~by~𝕊T𝔼P™))what is the cheapest day to book a flight on United airlines? ((™𝕊T𝔼P~by~𝕊T𝔼P™))what is the cheapest day to book a flight on United airlines? ((™𝕊T𝔼P~by~𝕊T𝔼P™))what is the cheapest day to book a flight on United airlines?   Website URL: https://support.google.com/edu/classroom/thread/333634866?authuser=2&hl=en&sjid=5624141131321175365-NC