Loads of complaints with Frontier but are they a major? If that is the case, where is Spirit? And B6 with the 2 hr Tarmac, I now understand why they cancelled OPS the other day. It's cheaper to shut down the operation and reimburse than to deal with DOT Tarmac ($27,000) issues. DL needs to improve on bumped passengers (oversold). Watching a redcoat explain to a passenger is painful.