Low-cost carrier Frontier Airlines admitted to incentivizing employees to charge extra baggage fees at the gate to passengers with oversized bags, a move that drew criticism from customers and industry experts. According to a memo obtained by CNN, Frontier Airlines offered bonuses to gate agents who collected at least $1,000 in fees per flight. A senior vice president of Frontier Airlines allegedly sent a memo that urged staff to enforce size restrictions and use a measuring stick to charge passengers with oversized bags. Frontier Airlines spokesperson, Zach Kramer, confirmed the memo’s authenticity but stated that the incentives were part of a “pilot program” that has since been discontinued. The memo…