how about this scenario.

i was on a dl flight ont-slc at 7am. they came on board and offered $750 voucher each for 2 people. they would book you the next day as all 4 flights that day were oversold.

i had a refundable ticket ($900). if i had volunteered, could i have taken the voucher, refunded my ticket and walked over to ua and purchased a ticket for $450 on their next flight which had openings?

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f