A diet expert has some food for thought for flyers - which airlines offer the best and worst food.
Every year Dr Charles Platkin, a lecturer at the City University of New York School of Public Health, investigates the nutritional value of snacks and meals offered by 12 US and Canadian carriers and provides a calorie breakdown of what's available.
And this year's results are out, with the food served on Delta and Virgin America flights rated the best.
US diet expert Dr Charles Platkin has analysed the nutritional value of the snacks and meals on offer on 12 US and Canadian airlines. The 2017 Annual Airline Food Investigation published on dietdetective.com rates both airlines four out of five.
Dr Platkin praises Delta and Virgin America for not only offering healthy snacks and meals but also being very forthcoming with the nutritional information about all of their items.
The average calories overall (including meals, snack boxes and individual snacks) on a Delta flight is 480, while on Virgin America it is only 340.
Other airlines to rank highly include Air Canada and Jet Blue, who both score 3.75 stars and Alaska Air, which has been handed 3.5 stars.
Delta Air Lines, pictured, is rated as having the healthiest choices along with Virgin America
However, coming 10th and 11th is Allegiant Air and Spirit Airlines who earn 1.75 stars, while rock bottom is Hawaiian Airlines, which has just one star and gets Dr Platkin's 'Shame on You' award.
According to Dr Platkin the average calorie count on Hawaiian Airlines is 568 and he added that the carrier was not very forthcoming with calorie information.
He found that a meal served on a flight from New York to Honolulu that consisted of penne pasta with mushrooms, beef meatballs, marinara sauce, grated parmesan cheese, mixed bean salad and a sweet treat contained a total of 1,480 calories.
Dr Platkin found one meal served on Hawaiian Airlines contained over 1,400 calories, more than two Big Macs
Eating two Big Macs would pile on fewer calories as they have 550 each.
He said: 'Hawaiian Airlines’ food is high in calories and the menu doesn’t offer much choice either in terms of health.'
While much of the report makes for unappetizing reading, Dr Platkin praises airlines for axing oversized packages of snack foods in favour of smaller versions or eliminating them all together.
MailOnline has contacted Hawaiian Airlines, Allegiant Air and Spirit Airlines for comment.
THE BEST AND WORST AIRLINES FOR FOOD IN 2017
Delta, 4 stars, average calories 480
Dr Platkin says Delta is a clear leader among the bigger carriers when it comes to offering healthy food and being transparent about its nutritional value. He recommends their almond nuts as being the best snack on offer.
Virgin America, 4 stars, average calories 340..
Dr Platkin says Virgin America's individual snacks are 'unhealthy'
According to Dr Platkin, Virgin America is still the only airline that provides nutritional information for all items, giving passengers a real choice. However, he added that the individual snacks should be avoided as they are 'unhealthy'. He instead advises paying for a real meal as it will keep you fuller for longer.
Air Canada, 3.75 stars, average calories 320
Air Canada is praised in the study for keeping nutrients high and calorie counts low. Dr Platkin also commended it on offering meals rather than snack boxes, which can be unhealthy. His recommendation for an onboard breakfast is the Avocado Smash Box with fresh guacamole, hard-boiled egg, green apple slices, and multigrain muesli bread.
JetBlue, 3.75 stars, average calories 337
For JetBlue, Dr Platkin says that although the individual snacks are still low in calories they are also low in nutritional value. The airline also offers free snacks, which he added included nothing healthy.
Alaska Air, 3.5 stars, average calories 479
According to Dr Platkin, Alaska has always been committed to food, just not the healthiest. However, as it is due to buy Virgin America, he said he was told it is going to add many of VA’s healthy food choices to the menu. He found that the healthiest thing on offer was the Mediterranean Tapas snack box.
United Airlines, 2.75 stars, average calories 416
Dr Platkin suggests that United should change its food policy as it has 'very little food transparency on the website'. He also added that the individual snack choices are generally not healthy, the snack boxes could be much more food/healthy thoughtful, but that the meals are average to OK.
American Airlines, 2.5 stars, average calories 446
AA's healthiest snack on board is the hummus box.American has been offering main meals in its cabin since March, but Dr Platkin says they are 'nothing very healthy'. He also criticised the airline for not publishing any food or nutritional information on its website. The healthiest snack you can get on board is the hummus box.
Frontier Air, 2.25 stars, average calories 372
Frontier Air's 2017 menu has remained the same since last year but Dr Platkin said it promptly shared all nutritional information about its menu. He added that the trail mix was the healthiest thing to purchase but passengers are better off bringing their own food.
Southwest Airlines, 2 stars, average calories 125
Dr Platkin says Southwest offer the least in terms of variety, even though all snacks are free. He suggested it road test some more healthy alternatives. If selecting a snack, he suggests going for peanuts.
Allegiant Air, 1.75 stars, 402 calories.
Allegiant Air does have some healthy food - such as the nut medley
Dr Platkin says Allegiant would benefit from healthier options on its menu, which he believes passengers would buy.
He suggests that the nut medley is the best in terms of a snack, but only if you share them with another person.
Spirit Airlines, 1.75 stars, 316 calories.
The airline's hummus and pita chips is the best bet, says Dr Platkin
For Spirit Airlines, Dr Platkin says it needs to reduce its snack sizes as they are too large and also suggested it offers more healthy options. He says the best bet for a satisfying snack is the airline's hummus and pita chips.
Hawaiian Airlines, 1 star, 568 calories
Coming bottom of Dr Platkin's table is Hawaiian Airlines, which has the biggest average calorie count and which he says offers nothing in terms of health. He also added that his team of nutritionists had to estimate what was in the food as the airline was not forthcoming with information.