Delta Air Lines' earnings per share have been soaring, with growth rates sky high. An added bonus for those interested is that management hold a heap of stock and the CEO pay is quite reasonable, illustrating good cash management. The drastic earnings growth indicates the business is going from strength to strength. Hopefully a trend that continues well into the future. Delta Air Lines certainly ticks a few boxes, so we think it's probably well worth further consideration. What about risks? Every company has them, and we've spotted 1 warning sign for Delta Air Lines you should know about.