Flying during the holidays can be a frustrating experience, not just for travellers but for airline employees as well. Case in point: the workers at United Airlines who rank the lowest in terms of employee happiness according to a PayScale infographic.

To determine the happiest and unhappiest airline, the survey looks at a few factors that deal with job satisfaction, such as employee pay, the number of stressed workers and overall job satisfaction. On the consumer end of things, the infographic also lists airlines' on-time arrival rate, airline baggage fees as well as complaint rates.

To see how each airline fared, check out the infographic below.

by PayScale.Learn about infographic design.

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• Blanket Fee

  Back in 2010, American Airlines <a href="http://www.huffingtonpost.com/2010/02/08/american-airlines-to-char_n_454109.html" target="_hplink">started charging $8 for blankets</a>.

• Ryanair Boarding Pass Fees

  Songstress Lily Allen took to twitter to express anger over<a href="http://news.travel.aol.com/2011/06/06/lily-allen-twitter-ryanair-boarding-pass/" target="_hplink"> Ryanair's policy of charging passengers to print out their boarding passes</a>.

• Spirit's Online Booking Fee

  In November 2011, Spirit Airlines <a href="http://www.huffingtonpost.com/2011/11/14/spirit-airlines-raises-on_0_n_1093430.html" target="_hplink">raised its domestic "passenger usage fee" (aka online booking fee) from $8.99 to $16.99</a> each way.

• Fuel Fees

  Southwest Airlines <a href="http://www.huffingtonpost.com/2012/03/26/southwest-airlines-fees-fuel-costs_n_1381008.html" target="_hplink">raised its ticket prices by $4 to $10 to offset the high cost of jet fuel</a> in March 2012. Its subsidiary AirTran, plus United Airlines, Delta Air Lines, American Airlines, US Airways, Frontier Airlines and Virgin America followed suit.

• Ryanair Emergency Row Fee

  Ryanair found itself under investigation after <a href="http://www.huffingtonpost.com/2012/03/20/ryanair-in-hot-water-over_n_1366497.html" target="_hplink">instituting a 10 pound fee to sit in the emergency row</a>.

• Allegiant Air's Carry-On Fee

  In April 2012 the budget carrier announced a <a href="http://www.huffingtonpost.com/2012/04/02/allegiant-air-carry-on-fe_n_1397911.html" target="_hplink">$35 carry-on fee</a>.

• Spirit's New Carry-On Fee

  A month later, low-cost Spirit Airlines <a href="http://www.huffingtonpost.com/2012/05/02/spirit-airlines-carry-on-fee_n_1472508.html" target="_hplink">upped carry-on fees to as much as $100</a>.

• Airlines Could Charge Extra For Seats Together

  Late May 2012 saw airlines start to <a href="http://www.huffingtonpost.com/2012/05/21/airline-charges-seats_n_1533866.html" target="_hplink">reserve more window and aisle seats for passengers willing to pay extra</a>. This would make it it harder for friends and family members to sit next to each other.<br /> <br /> Sen. Charles Schumer urged airlines to <a href="http://www.huffingtonpost.com/2012/05/27/chuck-schumer-airlines_n_1548794.html" target="_hplink">allow families with young children to sit together without paying extra</a>.

• United's $100 Bag Fee

  In June 2012, United <a href="http://www.huffingtonpost.com/2012/06/12/united-airlines-raises-international-bag-fee_n_1589223.html" target="_hplink">raised its fee for a second checked bag on trans-Atlantic flights to $100</a>. Delta had done the same a few months earlier.

• Wizz Air's Carry-On Fee

  Carry-on fees have finally hopped the pond. <a href="http://skift.com/2012/07/09/carry-on-bag-fee-spreading-wizz-air-charge-europe/" target="_hplink">European regional carrier Wizz Air instituted a 10 Euro (about $12) fee to use the overhead bins</a>. Bags that fit under the seats still fly free.

• Credit Card Booking Fee

  In August 2012, Airefarewatchdog called out <a href="http://www.huffingtonpost.com/george-hobica/the-latest-airline-fee-credit-card_b_1829396.html">Allegiant Airlines for charging more to book flights via credit card</a>.

• Southwest Airlines' Early Boarding Fee

  <a href="http://www.huffingtonpost.com/2013/01/22/southwest-airlines-fees_n_2525443.html?utm_hp_ref=travel#slide=more232494">Southwest passengers can pay $40 to be one of the first 15 people on the plane</a>, as of January 2013.