Flight from St. Paul to Philly delayed twice for Philly weather. Got on and off plane and out to runway twice. Third time we get to the number one position for takeoff only to be told we have to go back to the gate because the instrument panel is showing a thruster problem. Turns out it’s not a computer glitch… reverse thruster not working right. Have to switch planes completely. Delta gives us all food voucher to tide us over while we wait. Food voucher is for $6. Cheapest sandwich in cheapest kiosk is $7.39. Good news… liquor free on flight to Philly when we finally depart three hours late. Drinkers rejoice… I guess.